Eating Problem

Hi guys, I am 15 and I have always been self conscious about my body, and it’s gotten to the point where I now feel a shade of guilt after I eat anything. I see all of these girls with flat stomachs and beautiful bodies, and I am dating an athletic guy who always reminds me that I am beautiful, but I just can’t get that through my head. Sometimes, people comment about me and they don’t intend to be rude either. I always look at the people on my 600lb life and fear that I will end up like them. But the things I eat make me feel like I will. For example, I don’t eat breakfast, for lunch today I had cheezits and a pb&j, after school I had Ice cream and a pizza, and rn (5:37) I ate macaroni. I eat vegan food sometimes too when my mom’s bf is around. But I look at my friends at lunch and they don’t eat as much as I do. Ever since mom and I moved out from our abusive home last year, I have been better, but I still feel fat. I try to tell my mom and her boyfriend, but they always say I am fine because I am 5”4 and 140lbs. But I still don’t believe them. I don’t know what to do.