How to make my arms legs&stomach skinnier!?

im 13..so please dont say not to worrry about size at my age. i have alot of bulky mucsle. i want muscle but not the bulky kind!! i want skinier legs,arms&stomach...but idk how cuz im a cheerleader&tumbler.i want to lose alot of weight but not be anerexic or starve myself!! what some stuff or tips i can do?