How do I get rid of these "friends"?

A few months ago, I started hanging out with this girl. Let's call her R. So R and I are cooking partners in Food and Nutrition, and everything is going great. Then R tries to get me to know her friends. At this time, I was a good student who was very shy and wanted to break out of my shell. I agreed and She, two boys named D and L all became friends. L and I started talking in the Library almost everyday, and he flirted with me a lot. At the time, I had begun to want a boyfriend to get a hug everyday. I know now that was a mistake. So L asks me to be his girlfriend of a text message. I really did like him as a person at the time, so I agreed. We dated up until recently when he broke up with me because we didn't have common interests. During the two months we were dating, I got my first detention because of him, got grounded by my mom for his PDA in front of her (we were in the pull and he kept giving me his version of chest compressions while R held me down so he could), and a nasty rumor started about me making out in the hall. During the two months, R had used me to get with my friend J. After much planning on my part, I managed to get L, R, J, and myself at the mall. R seemed really happy, so it made me happy. Two weeks later, she's after some guy named DC. Her sister tells her mom about DC and she's not allowed to date him. So she goes back to liking J. After a few more weeks, she likes my brother S. She only wanted to sleep over at my house to see S. L didn't like this. L broke up with me very recently and I was hurt. D called me and asked me how I felt and told L and R everything I said. The night he broke up with me, I turned to my old friend RK. She helped me out and made me feel better. R felt offended that I didn't go to her. Now L is calling me a pscho and R hates me. I just want to go back to my old lifestyle with a few loyal friends, video gaming, and school work. I deleted my FaceBook, so now how do I get rid of all these "friends"?