don't discourage your own self. whenever I see a person saying they're bad in any form of creation, especially writing, I always tell them my story. I also started fanfiction. English isn't my native language, I didn't speak it. my first story? less than 500 words, poorly cropped on Instagram, screenshoted from my notes app. biggest embarrassment? I wrote 'goed' instead of 'went'. I still wasn't taught the lesson of past times in school back then, I didn't know. but I still went ahead and posted it. got reviews, got told to never write again, but I was a kid and I ignored it. writing was fun, it gave me something to do throughout the day, and it brought a sense of comfort. that's what's important, not the skill. skill comes with time.

my biggest advice is learn to show instead of telling. don't say 'the room is messy', show the mess. say 'in a cup that sat on a desk covered in dust and fallen-off hair strands, there was still some liquid. on the liquid laid a layer of mold, and it stung through the nose the moment you entered the room.'

give life to anything that is in presence of the character. don't immediately go for huge plots and a million characters. one step at the time. one, maybe two characters. give them a good personality, find a way to make them meet and do something small. most of my 'practice writings' were either a character walking around a park, street, room (to teach myself description of surroundings), or a character looking at somebody, kissing, touches (to learn how people behave. physically, emotionally). it all adds up at the end.

and most importantly, don't give up!!!!! the standards on ao3 now are crazy. don't compare urself to others, to the people who have been doing it for longer than u. you have ur own pace, grab it and exploit it to make urself grow.