I really enjoyed Hero by Perry Moore it is a teen book and has a bit of a fantastical element to it but I enjoyed it. It's especially good for people who are into Comic books are just comic book characters.
Okay so you like fantasy.
Try Hero by Perry Moore. It's written like a comic book but in novel form. Stan Lee who created pretty much every Marvel Comics hero and villain you know loves it. That's enough for me, really.
Carry On by Rainbow Rowell is sort of like a queer Harry Potter fanfic. It can seem kind of cheap if you haven't read her other book Fangirl and go into it knowing it's supposed to be a fanfic, but it's a cute story in its own right.
And since you're not opposed to reading graphic novels, you might like Young Avengers by Allen Heinberg and Jim Cheung. The first run does a solid job of introducing the heroes two of which include Wiccan and Hulkling who are the fucking cutest. There's also a second series and a third (which is arguably the best comic arc I've read in a good while).
Hero by Perry Moore. The protagonist is gay. It is a coming of age book.. with superpowers. It is the only book I have read with a gay protagonist, and I really enjoyed it :).
Perry Moore's Hero for something with a fantasy bent
There's a book about a kid trying to become a superhero, and he happens to be gay. You might like it! http://www.amazon.com/Hero-Perry-Moore/dp/1423101960