I need someone

I’ve been having some body issues recently, I’ve been gaining weight but when I was younger I was pretty much a stick. Now I’m not so much a stick. I’m now a size 5 or 7 in jeans I was just a 3 about a year ago. I’m now a medium in forever 21 dresses, I’ve been a small. I’m an 11th grader btw. My dad calls me a fatty and today my aunt and cousin came over and said I’m gaining weight, my face is getting fat, and I should lay off the in n out. I know there’s people bigger than me so I probably sound selfish but I honestly don’t know how to deal with my own family members calling me fat. The worst part is they’re bigger than me, by a lot! I wish I was the weight I was 2 years ago.