I find that when I want to achieve something in playing music, playing by ear, sight reading, or creating music, melody on DAW ¶
¶
I need to, or specifically I haveI need to learn a bit of music theory.

need to and have to have the same meaning in this case

Honestly, it's not a bit - for me,. I've never wanted to learn anything since I wasbecause I'm often wrong,. I hate when I had to learn more than 10 subjects in schools without knowing why I have to study all of them.

But wthen I realized why I need to learn music theory, perhaps I really love music, the joy, and the color it brings to me, to. It helped me wenget through hard times.

I want to bring my own music, my own to to other people.

I gotta learn the Circle of Fifths, harmony, and practice sight reading.

But when I know that it could makgive me able tthe ability to do something I really want, somehow I don't have bad thought to it.

If you're looking for something that sounds better than bad thought to it, here are some to consider:
"Somehow I find I don't mind it"
"somehow it doesn't bother me"
or you could even say "But when I know that it could give me the ability to do something I really want, suddenly it becomes worth it."

I find that when I want to achieve something in playing music, like playing by ear, sight reading, creating music, or making a melody on DAW ¶
¶
, I need to, or specifically I have to, learn a bit of music theory.

Nice job with a complex sentence like this one. I think most people would find a way to write this with shorter sentences instead of one long one, but it is perfectly OK as I see it.

Honestly, it's not a bit -g deal, but for me, I've never wanted to learn anything since I was wrong,younger, and I hate when I had to learn more than 10 subjects in schools without knowing why I haved to study all of them.

I didn't understand "bit -" but this might be something you agree with above.

But when I realized why I need to learn music theory, I thought perhaps I really love music, the joy, the color it brings to me, to help me wenget through hard times.

"get through" sounds pretty natural, but you could also say "go through" or just "in" or "during"

I want to bring my music, to my own to people.

I am not totally sure if the correction means what you wanted to say, but if you mean that you want to learn to bring good music to people you love or care about, this would be a decent way to say it.

I gotta learn the Circle of Fifths, study harmony, and practice sight reading.

it is more normal to have a verb in each item OR only one verb before the first item that applies to the whole list

for example:

I want to read a book, watch a movie, and write on LangCorrect.

OR

I want to read a book, a magazine, and a newspaper.

But when I know that it could make me able thelp me do something I really want, somehow I don't have bad thought tos about it.

(Could you think of any sentencphrases better than "bad thought to it"?)

I find that when I want to achieve something in playing music, playing by ear, sight reading, creating music, or melody on DAW ¶
¶
I need to, or specifically I have, that I need to learn a bit of music theory first.

"Have to" and "need to" mean the same thing most of the time. There is a subtle difference in that "have to" can mean you are forced to do it, or else. E.g., "Mom says I have to be home by 8 PM." Here, mom is imposing this requirement on me. But in your sentence, they carry the same meaning, so there is no reason to say them both.

Honestly, it's not a bit - for me, I've(a big deal / no small feat) for me. Since I was young, I never wanted to learn anything since I was wrong,. I hated when I had to learn more than 10 subjects in schools without knowing why I haved to study all of them.

"It's not a bit" here isn't understood. Since "a bit" means a small amount, do you mean to say that it is not a small thing for you? If so, one of the two suggestions here will work.
"Wrong" doesn't make sense here, I think you meant "young?"

But wthen I realized whythat I needed to learn music theory, perhapsbecause I really love music, t. The joy, the color it brings to me, tohas helped me went through hard times.

"Perhaps" means maybe yes or maybe no. It's clear that you do, in fact, love music, so replace perhaps with because.

I want to bring my music, my own to people.

This sentence works well on its own. But if you really want to emphasize YOUR music, here is an alternative: "I want to bring music of my own to people."

I gottahave to learn the Ccircle of Ffifths, harmony, and practice sight reading.

"Gotta" is considered slang and not grammatically correct. Equivalent for "have to"

But when I knowrealize that it could make me ablallow me to something I really want to do, somehow I don't have bad thought toa problem with it.

What you are describing is a realization; you did not appreciate studying in school before, but now you know that studying music is worthwhile => you realize.
"To have bad thoughts about" doesn't sound right in this context; I suggested something more natural

I find that when I want to achieve something iwhen playing music, like playing by ear, sight reading, or creating music, and melody on DAW ¶
¶
I need to, or specificallyies in a DAW, I have to learn a bit of music theory.

(1) Alternatively, you can omit "achieve something", which might be more concise: "I find that when playing music, when I want to play by ear, sight read, or create music and melodies in a DAW..."

(2) The tenses are inconsistent: "play by ear" is in the simple present while "sight reading" and "creating music" are in the continuous tense. In this situation both will suffice, but it needs to be consistent. Here I have gone with the continuous form, but you can also use the simple present: "I find that when I want to achieve something when playing music, like play by ear, sight read, or create music and melodies in a DAW..."

(3) In this context "melody" is more appropriate as a countable noun.
(4) Both "I need to" and "I have to" convey the same sense of necessity, so it is redundant to have both.
(5) By the way, in this context, instead of "specifically", I think "rather" might be a better word to use. For example: "I want to, or rather I have to do my homework now."
(6) These two paragraphs are one single complete sentence, so I have removed the line break in between them.

Honestly, it's not just "a bit" - for me, I've never wanted to learn anything since I was always wrong, and I hated it when I had to learn more than 10 subjects in schools without knowing why I haved to study all of them.

(1) The phrase "it's not a bit" might be a little difficult to understand immediately: in fact, for a while I was confused because I thought by "bit" you were referring to a joke or an act. I have hence tweaked it so the meaning gets across without ambiguity.
(2) I'm not completely certain about what you meant to say with "since I was wrong", so I took a guess at it. By itself the phrase is a little ambiguous: what are you wrong about? When were you wrong?
(3) "When" references a time period, and since you used "had", we are in the past tense. Hence, "hate" should also be in the past tense ("hated"). Alternatively, if you want to keep it in the present tense: "...and I hate that I had to..." In this case, "hate" refers to your present feelings.
(4) In this context, "school" refers to the broad concept and is hence used as an uncountable noun. Another example would be the phrase "I'm going to school" (as opposed to "I'm going to the school" or "I'm going to my school").
(5) Keep the tense consistent. You used the past tense in "I had to learn", so you should also use it here in "I had to study".

But when I realized why I need to learn music theory, I also realized that perhaps I really love music, the joy, the color it brings to me, toy life, and it helped me went through hard times.

The grammatical structure is "when [action], [action]", but you seem to be missing the second action in your original sentence.

I want to bring my music, my ownself to people.

Perhaps "myself" is the word you're looking for. "My own" references an object, as in the phrase "my own music" or "my own personality", but that seems to be missing here.

I gotta learn the Circle of Fifths, harmony, and practice sight reading.

But when I know that it could make me able tan allow me to do something I really want to do, somehow I don't have bad thought todislike it.

I rephrased the first part of your sentence so that it sounds more natural, at least in my view.

(Could you think of any sentencphrases better than "bad thought to it"?)

(1) Strictly speaking, "bad thought to it" is a phrase, not a sentence. A phrase is a part of a sentence that is not the complete sentence.
(2) Alternatively: "Can you think of any phrases better than 'bad thought to it'?"