I Can'T Function When I Am Surrounded By People

My high school years were a nightmare. I don't even know how I graduated, no one does. It really isn't worrying about what others think of me. I just get these horrible suicidal thoughts whenever I am in school or surrounded by too many people. I can relax at a party because of the music but other than that I just shut down. I just started my freshman year in college, first semester, last week. The second week has not ended and I've been crying for two days straight. I want to drop out. I don't want to do it. It's not the work, I am not stressed by this because I have all the time in the world. I'm simply not happy in a school environment, I hate it. At the gym I don't even push myself as much as I would like to if it's the "packed hour". I was standing, looking at everyone for about ten minutes before I decided that I wanted to go home. I stopped halfway through my workout. I cried in the bathroom, I cried when I got home, I've been crying since last night and I'm still crying. It SUCKS. I really want to go to school, I really want to go to the gym. I just hate being in those kinds of environments. I can not function!!! :(