I need advice..

So, there's this boy... This nice, funny, intelligent, VERY attractive boy. Everybody says that he likes me and he flirts with me all the time. And I know I am getting a head of myself here, but if he really does like me and if I really do like him, could it even go anywhere? I'm not sure how I feel about him yet, but is that fear or me just not being interested?
We hang out a lot and I feel like I know him, but he doesn't know anything about me. Not really. He knows the basic stuff. What kind of music I like and stuff like that. But getting to my mental stability... I can't even think about it.
I knew that this might happen someday. I'd find a guy when I go off to college. Nice enough, but I could never let him know me, truly and I'd break it off before it got to that point. But I feel like it just ran up on me. I'm too young, this is too soon, I'm so unprepared. What do I tell him my pills are for? Why I can't drink at parties? What if I snap and hurt him?
So the question is; do I give him a chance, or shut him down for his own good and my fear?