People bringing me down

I’ve wanted to lose weight for a while cuz I’m basically the DUFF of my friend group and I can tell they are judging me. I also always feel bigger than everyone. I try to eat healthy but then my parents buy fatty foods. If my dad sees me eating he will sometimes point at my stomach and say “ looks like your eating for two.” Or something similar. He also makes fun of my mom who also struggles with her weight. What should I do?