It feels like they awere made for them to hide from the world, to never date a "real" guy who has "real" flaws and wouldn't unconditionally love you.

It should be "were" and not "are", since the romance books were written in the past.

And I am 💯 that target audience who, I don't know why, decided to try to date that "real" guy.

(1) Commas will make what it is that you intended to mean much clearer. Notice the placement of the commas: the main phrase is 'that target audience who decided to try to date that "real" guy.' "I don't know why" is the interjection, so the commas go around it.
(2) It should be "decided" and not "decide", since the date happened in the past.

And after the expected break -up I understood I am a very very very lonely person.

(1) You need an article before "expected break-up", like "the" or "an".
(2) "Break-up" is hyphenated.
(3) You also need an article before "very very very lonely person."

I don't have close friends I can cry my shoulderwhose shoulders I can cry on, if I do have someone they are inon the internet.

(1) "My shoulder" implies that you're referring to your own shoulders, but you're referring to friends' shoulders. We can use "whose" to attribute "shoulders" to "close friends".
(2) "Shoulder" should be plural ("shoulders"), since "friends" is plural, and more than one friend implies more than one shoulder.
(3) The phrase is "on the internet", not "in the internet".
(4) You need the article "the" before "internet". Without "the", "internet" would refer to your internet connection, as in the sentence "My internet is slow."

And the most stupid thing is I am not(that) I am no longer satisfied with reading romance storyies after I discovered what it feels like in reality, to hold someone.

(1) I'd suggest "no longer satisfied" rather than "not satisfied", because "no longer" more effectively conveys a change, that you'd enjoyed romance stories before, but now you don't anymore. You also conveyed this sense of change when you used the word "after", which is why I made this suggestion.
(2) "Story" should be plural ("stories"), since you're referring to romance stories in general, rather than a specific one.
(3) It should be "discovered" and not "discover", since this discovery happened in the past.

It's my first time writing some text in English and it's about me whining about some little boy.

Alternatively, and more succinctly: "It's my first time writing some text in English and it's me whining about some little boy."

You know these sometimes cringe, lovey-dovey romance books for little/ young girls and lonely ladies?

It feels like they awere made for them to hide from the world, to never date a "real" guy who has "real" flaws and wouldn't unconditionally love you.

And I am 💯 that/ their target audience, who, I don't why decided to try to date that "real" guy.

And after an expected break up, I understood (that) I am a very very very lonely person.

Instead of "very, very... ", you could use the word "extremely".

I don't have close friends so I can cry myon their shoulder onf, if I do have someone, they are inon the internet.

And the most stupid thing is that I am not satisfied with reading romance storyies (even) after I discovered what it feels like in reality, to hold someone.

So yeup.

What a pity.

Don't say that. It's good to write down your thoughts and feelings. It's completely normal.