Body Image Problems

I've noticed for a while I have been struggling with my image. I hate it when people take photographs and I usually avoid them. Compared to my friends, I have more of an athletic build. They are petite and small while I'm a bit bigger. Every time I eat I feel extremely guiltily (I'm a vegetarian). I workout at least 3 times a week and I eat well but I'm always paranoid about how I look. I avoid wearing tight fitting clothes and I feel like I'll never be in another relationship because I'm don't have a petite figure with a small waist. I don't know what to do... at times I feel like I'm the ugly girl in my friend group and it's so fucked up to feel like that...I feel so stuck cuz I can't shake this feeling off.