Some people just enjoy the process and know they don't have to get good in everything... You're really good in trying things out, yeah!
Piano and languages can be hard, so kudos for even trying!

I'm not really good at sports or games either, but I've enjoyed walking or some slow running... Have you tried to find some things you just enjoy, regardless of the 'outcome'?

I too think you have a way with your writing, though I'm also frustrated with my own writing and organizing it (a book or a few)... It can be hard... I too have cliches in my book/s but I intentionally put them there to have fun with them, if that makes sense? Like a sort of parody of other books/the genre... So maybe you can play around with your cliches as well?
What genre/s have you been trying to write? Some books are full of cliches but they are still good books...

Do you have a job or do you study? In that case you already have a lot. What about relationships? Do you have friends that like you for who you are, a significant other?
I've been really good at languages and in school, but it doesn't seem to help me much these days, profesionally or otherwise... I see people who had much less success in school being more successful professionally, having marriages and families... Things to consider...