Is this too angsty for mainstream?

My story is basically about a teen outsider who becomes a street artist who goes by the tag name of "Hero". He loved comics when he was little, but his mother hated them, and when she found his stash, she burned them all. After that, he couldn't look at comics in the same light.

He doesn't socialize well, and he knows, so he lets out all his feelings through his artwork. After a series of events which I don't have time to explain completely, he ends up expressing all the things he can't tell people, but wants to, through street art, hoping they will listen to him better.

For a while it helps him, and he feels less lonely. But then the thrill wears off, and he falls even deeper into a depression than before. He decides to commit suicide, and the epilogue involves various people visiting his tombstone and the impression he made on them.

Would this fit mainstream or do you think it would fit best in another category?

Based on the story itself, it could be mainstream, but it really does depend on the execution of the writing and your particular style.

It might help if you considered the audience you're aiming for and what else that audience enjoys.

This sounds like a YA novel in the making.
I'm not sure if it's mainstream fiction...It doesn't seem to cross into many genres. But angst has nothing to do with it being mainstream or not haha

My issue is that I don't believe the style would appeal to the YA audience. Do you still think I should?

I don't see why it wouldn't.
There's a lot of kids who see themselves as angsty "misfits" so I actually see a large audience for this kind of work in the YA market.

Right on, I'm with her^. This sounds like something I'd like to read. But if that doesn't satisfy you and worse comes to worse you can figure out what genre it is when they put it on the shelf in the store.