I tried, but procrastination keeps me down.

WI wake up again at 1pm, open my eyes, and reach onfor my iPad.

PI play yYoutTube, anime, movies, etc.

No learnI don't study English, learn a high-income skill, piano, or do someanything.

Since this is in the negative, anything fits better than something

My life is just keeps repeating,; every day is the same.

I tried to be disciplined, but it didn't work.

I tiried so many methods, but yeah, life goes on, nothing has changed.

I hate myself, I was scared of being like this for a lifetime, forever.

Here's my 2nd day of writing a daily diary, a journal.

This is fine but you could also just select one, diary or journal

I still failed, am still afraid of being stuck, have a lot of things that I don't know how to solve, in order to keep going.

But I know that if I keep going, keep grinding, nothing can stop me, there's no more to be regret.

Every day, I wake up, feeling tired, miserable, then go back into bed.

"in bed" would mean that you got out of bed to go somewhere and came back

"to bed" can also mean that you go back to laying down or sleeping, even if you didn't get out of bed

Wake up again at 1pm, open my eyes, reach onfor my iPad and play youtube, anime, movies etc.

it is usually "reach for" or also "get on"

also I combined the next sentence with this one because they are so closely related and the next sentence needed a subject.

Play youtube, anime, movies etc.

Not learning English, learn a high-income skill, how to play piano, or doing something. else.

this is technically an incomplete sentence, but that could be okay if the tone is what you are trying to say.

A more technically correct version would be:

I'm not learning English, a high-income skill, how to play piano, or doing something else.

My life is just keeps repeating, every day is the same.

technically, it should say "and every day is the same" or "like every day is the same"

Every day is two words when it means "each day". I go to work every day.

Everyday is one word when it means "normal" . I work an everyday job.

I tried to be disciplined, but it didn't work.

or "I tried to have discipline"

I tiried so many methods, but yeah life goes on, nothing changed.

Here's my 2nd day of writing my daily diary, journal.

diary and journal are repetitive

I still have failed, I am afraid of being stuck, and I have a lot of things that I don't know how to solve, to keep going.

adding the subject "I" helps readability here

But I know that if I keep going, keep grinding, nothing can stop me, there's no more to be regret.

you can sometimes try phrase constructions with different verbs to see what looks best:

1. there's no more to be eat
versus
1. there's no more to eat

2. there's no more to be buy
versus
2. there's no more to buy

technically, the sentence is a fragment, but people do talk like this naturally

Because we only live once.

this is also a fragment, but people do talk like this

A technically correct version would be:

We only live once.

or

Nothing can stop me and I won't regret grinding because we only live once.