So many problems with my life, always sad please help!!?

my name is sophia and im 18 years old. I was sooo happy back in april but ever since then everything has gone down hill and ive been having terrible mood swings. I had a boyfriend named kevin and we were so happy together but one night I got drunk and made out with me & kevin's friend Tommy. Kevin found out and he broke up with me and it stil kills me to this day that he doesnt love me anymore when I still am in love with him. I lost my virginity to kevin and after we broke up I went crazy and ended up having sex with 4 other guys.Kevin wouldnt talk to me for the longest time and I had several mental breakdowns because of this. Some days are better then others but somedays, like today, im an emotional mess and my friends are really starting to get annoyed with me and im losing them. Kevin sort of talks to me now but he still doesnt wanna see me and hes never gonna forgive me. Ive turned into a complete slut and i want that to change. I wanna be a respectible girl and I dont wanna drink or have sex with anyone for a long time but i dont know how to accomplish all this...please help!