1`3 years old, 117 lbs, about 5'3"...overweight?

everyone tells me im fat. when im at home i feel fine, but whn i go to school i feel fat. is it just because i dont have a friend to tell me other wise?? im getting a bad image of myelf. am i overweight? theres no way i can lose weight, i am not aloud out of my house much so i cant ecercise more than i do. also i dont snack and i dont eat junk food. but my metabolism is slow. i cant change my diet from what i do. am i overweight? (plz say no)