Why Can't I be comfortable With My Body?

I am 126 pounds and about to be a junior. I feel like over time my stomach, gut, hips, and thighs have been getting so much bigger. I am not exaggerating, but my thighs are unporportionate with my body. Also, lately my hips, gut, and fat hang over my jeans and i hate it so much. My friends try to make me feel better but they are so skinny and can wear shirts that show their stomachs and look fine. They can wear jeans and look fine. I try to avoid it and wear sweatpants a lot with hoodies. I need help with what to do. I do eat a lot, and not so good. But, could that be why I have gotten this way? I used to be smaller.