Should I Stay With Him?

Uh, I'm bisexual. I'm gonna start with that. I've been with my boyfriend 3 months (I'm 15, if that's significant), and he's really great...except...I'm not physically attracted to him. At all. He's really funny, but I don't like a lot of his choices (smoking marijuana, drinking occasionally, and basically doing whatever he wants to do). I mean, he's only 16! Like I said, he's pretty great. But I don't know how I can keep a relationship with someone I'm not physically attracted to.