How do i make the guys stop?!?!?!?

basically i am 14 and i get all the guys of all ages after me!!! i wear barley any make up im just natrually pretty and i dont mean to brag but i guess i have a pretty good figure for my age, and i get all the guys at school asking me out and to do rude sttuff to them, and then i get random guys of about 30 in the streets wolf-wistling at me and pinching my bum! :O im so fed up i cant go anywhere without getting aload of guys being rude and perverted! how do i make them stop??!!!!