Kids your age should NOT be having sex. It is also not emotionally healthy to be thinking who your first should be or should of been at that age. I would avoid him and start worrying about what kids your age should be worrying about.
Then I think youve still got a bit of growing to do, especially since ur 12.
Percy Jackson, The Spooks Apprentice, and The School for Good and Evil
Lord of the Rings/The Hobbit, Pride and Prejudice, and Wuthering Heights are some of my favorites!
Beautiful Creatures books, Hunger Games, Divergent Books
Maybe this girl didn't have a lot of friends before. You should try to get to know her - maybe you two might have more in common than you think. Also, just because she's in the spotlight just now, doesn't mean that you're other two friends have forgotten you :) Hope I helped.