IM 15 years old, never had sex at all .. and theres was a small pimple shaped object on my penis.. i kept pickin at it by the next day it was big and i popped it and white pus came out. and after afew weeks it came back at the same spot so i picked it agian till it popped and its completely gone ... now i have the same problem in a different spot.. was is this a pimple or a STD