Crush

Okay so I've had a crush on this guy litterally since elementary school, and we used to be really close back then. Well in like 7th grade one of my best friends chased him away, but I still really like him. We hardly ever talk, mainly due to class schedules, but I want to talk to him really bad. We are both really shy quiet people so I'm afraid if I try to talk to him because I'm afraid he won't want to talk to me. Another important note is that we go to a really small snobby school where everyone is really judgmental so I'm afaid as a "fat" girl I will be made fun of for trying to hook up with this guy. Any advice?