I'm 12 years old 5'3 or 5'4 and 120 pounds am I over weight?

www.wolframalpha.com/input/?i=growth+chart+female,12yr,5%273%27%27,120+lbs&lk=6&ab=c

Type in your details and see what you get.

Hey, I'm just the same as you are, but a boy. No,you are fine the way you are but if you want to lose weight, don't try to lose it right away. Doing so will only stress you out.