I need help and opinions on what to do with my life?

I am 16yo boy, and I am depressed constantly. Recently, the **** has hit the fan in my life: I lost my beautiful girlfriend and i think about her constantly, running ideas through my mind of how I could have saved our relationship. People say to get over her and try for other girls but i cant, she was amazing and i have no contact with other girls because i go to an all boys school. I feel like i have no friends in my life; for the past 4 weeks i spent my Friday nights in my basement playing xbox and watching movies. I get along with a lot of kids in my school but we never chill out of school. My social life is so poor that even my parents have gotten concerned and have threatened to pull me out of this school and put me in my towns school, but i know for a fact this would ruin me even more and i love the school I'm in now. My town is full of pricks and s that love to pick on people and unfortunately I am one of the people to get picked on, to the point where I am afraid to go to public places because one of the people that bother me will be there. I have been spending a lot of time at the gym trying to get "cut" as to attract more girls or try and get back with my ex but i have my doubts if that will automatically attract women to me. My daily routine consists of me going to school, coming home, and spending my entire day on Facebook stalking my ex's profile which makes me even more depressed when i see other boys talking to her. I try to speak with her but she either never responds or she answers me so blandly that the conversation just stops. So here's my question(s) 1. What should I do about girls in general? (I'm not trying to just get with girls, I am looking for a relationship) What should i do about my ex? Try to get back together or just forget about her? If so, what are somethings i can do to get her out of my mind? 2. I need friends, no doubt about it, but how do I go about making new friends? 3. Should I stick with going to the gym? The sole reason I workout right now is to get in shape to attract women, not for any sports or athletics. I need to know if getting in shape will definately help me with women in the long run? Thank you for your help, and please no negative comments, I take enough **** in my life.