Don’t listen to anyone who calls you fat. That’s my advice! No one can dictate to you how you should look, and no one can try to put you down about your weight. I know it’s hard, but hold your head high and try not to let negative comments get you down. Learn to love your body and you will feel better. If you feel as though you’d like to lose weight, that’s fine, but I encourage you not to do it because someone else thinks you should. Being a teenager, this is probably part of puberty hitting (Unless you hit puberty earlier) There’s nothing wrong with being bigger, having big hips and large breasts. Learn to love what you have and you will feel better :) Don’t let people get you down. They have no right to make you feel bad about your body.
I hope this helps :)