Tell me what I should do :(?

I'm 14 years old and I've been having a lot of self-esteem issues since I was in 6th grade. Now that I'm in 9th everything has gotten worse. In my mind I’m ugly and fat. I’ve never had a boyfriend and I’ve never even had a guy like me, so that makes me feel even worse. Guys don’t want ugly girls—that’s why I haven’t had any admirers. I always feel really unattractive and inadequate next to all the other girls in my school and I hate being around others because I feel like they’re staring at me and thinking bad thoughts about me. I try to dress up nicely but whenever I wake up in the morning and look at myself I want to cry and give up. I don’t know what to do anymore. I can barely stand to be around my peers anymore. What should I do?