Am i over weight?? HELP! I seriously think i am fat?

I seriously think im fat by my mom tells me im not but of course she is gonna say that cause shes mom. i hav seriously issues with thinking i look ugly and i want to see ur guys' advice. i'm 13 years old. I'm almost 5 foot. I probably weigh between 75 and 89 lbs. i think my thighs are huge and my face is fat. And i fell stubby cause i think i look fat cause im short. Please help me!!!!!!