How do I deal with my dad?

I'm 15 years old, an only child and I live with my mum and dad. Basically, my dad criticises every single thing I do and has done so for as long as I can remember, and I am not exaggerating. He used to criticise my about my weight when I was younger and a little round, and fight with my mum over what she fed me. I lost a lot of weight recently and he started on how skinny I am and asks me why I'm too lazy to join a gym, despite me having already joined a gym to shed the pounds. He's never satisfied with my grades, and makes it a point to read out the marks of nationwide toppers while making snide comments. If I do extremely well in a subject it's taken for granted and if I do badly he criticises me and tells me I waste time. When a prof says anything good about me he will always s, snort or sneer. If I read anything another than my textbooks he'd take it away from me and tell me to study, despite that being the reason I did well in my english exams. If I don't hang out with my friends often enough he'll tell me that I have no "real" friends and that I'm too cold and snobbish to ever get any, and if I spend too much time with them I'm not giving enough importance to my studies, and if I study and don't go out I'm accused of not having a social life. I could go on but I'm just driving myself into a depression. Naturally, I have absolutely no self-confidence and I can hardly wait to go to college, which according to him I will never get into since my grades aren't good enough. I've gotten sick of arguing with him and just don't have the energy any more. How do I deal with him till I can escape to college?