Stuck with a controlling and clingy friend

Hey guys. I have a problem. My friend is really controlling of me. She always finds a way to get what SHE wants. I have discovered that ever since I became friends with her, I’ve lost ALL of my friends and now im stuck with her. At lunch in school, if I want to spread out a little and hang with other people, she takes it the wrong way and always says “are you leaving me” “are we still friends” and tries to get me out of it by saying “no let’s just walk outside” “no I have to do homework come with me” it’s always like “no I have to do this, so you have to come too.” And I always give in, because I don’t want to hurt her feelings. The whole friendships I have felt isolated, trapped (as if I can’t get out, like I’m in jail.), lonely, unhappy, annoyed, and I’ve become more shy than ever because I’ve been talking to this one person for so long, I socialize less and it’s almost like I developed her personality, because I’ve spent so much time with her. She always puts herself down, which in turn makes me feel the same about myself and develop the same attitude in life. I’m not extremely tired 5 days a week, I’m mentally exhausted because of her. I’m not anxious because of school, it’s because of her. I won’t ever forget one time she told me my outfit looked like shit. It stuck with me. And nowI’m more insecure Than I ever was because of her.

We always do what she wants, it’s never what I want. She follows me EVERYWHERE. I’m NOT my own person anymore, it’s like I’m HER. She made me lose all of my friends, and now that I’m making more friends she’s all of a sudden trying to join in and hang with me more. She took advantage of me because I’m nice, I’m kind hearted, and I don’t like saying no to people. I never stood up for myself when she made nasty, nasty comments about my appearance. I never said no to something I really didn’t want to do. She knew I am easily manipulated and took advantage of that, even if she didn’t know. She doesn’t have any other friends, really, just acquaintances. I cant spend the rest of highschool feeling isolated and trapped. I mean, she quilt trips me and changes my mind if I want to hang with others! This needs to stop. I need to be happy. She’s mentally draining, and after hanging out with my other friends I just feel so much happier, but after hanging out with her I feel like I’ve been insulted over 100 times and I feel empty and hopeless. The problem is, my other friends have other friends and I think it’d be awkward if I asked to hang out because I don’t really know their friends, and I wouldn’t know what to talk about. I need help. I feel like I’m going to be in this crappy situation for the rest of highschool. I’m honestly so angry at her. I’m angry at myself for letting this happen. I just want to gain confidence and independence, as well as become less shy and be happier. I feel like I could slip into depression any second. People avoid me because I have this annoying person attached to me every second of my free time. Please help!