I am 12 years old I am 5 foot 3 and I weigh 120 pounds I play a lot of sports I run everyday . Do I need to lose weight?

Why do you even ask?

Because a lot of people call me fat

That's because all those people are around 12 years of age and think they are funny. You sound fine to me. (P.S. Don't pay attention to stupid people.)

Thank you :)