Fly on the Wall by E. Lockhart
At the Manhattan School for Arts, where everyone is 'different' and everyone is 'special', Gretchen Yee feels ordinary. She sits alone at lunch, drawing pictures of spider-man, so she won't have to talk to anyone; has a crush on Titus but won't do anything about it and has no one to hang out with when her best (and only real) friend Katya is busy. One day, Gretchen wishes that she could be a fly on the wall in the boys' locker room - just to learn more about guys. What are they really like? What are they really cretins most of the time? "Fly on the Wall" is the story of how that wish comes true.