How can I get over this depression?

I recently decided to start a new me but for some reason nothings letting me. Im soo unhappy with everything about my life. I had this big time fall out with a group of girls at my school and I dont have any friends left at-all because of it. They make my life so hard. I have also always been self contious of the way I look. I know I have a big nose and big eyes but they have started to be aware of this even more since they dont let me forget it. Everytime I come on MSN theyre there teasing me. Theyve also started calling me a slag because I once went out to drink and ended up doing something with this boy who had a girlfriend after all. - I didnt know this at the time. Then to make things worse I had sexual intercourse for the first time and it hurt soo much. I know its meant to hurt abit but not like that and I had no sexual pleasure from it at all!!! ( is that right?). because of this I got pregant and had to have an abortion because my mum would have gone mad. Im in serious need of help. I cry every night and I dont want to go over the top and be a drama queen but I honestly feel like im trapped. I need some help. Please…