thedaddy your the first sensible teen that has admitted steroid use and not been a **** at people's reactions.
Get off the gear and get into PCT, i would probably go to the doctor and tell him everything, get full bloodwork, hormone and growth plate checks. Its probable that you have stunted your growth too :$
Did the gym itself sell you gear?? Did they know how old you are? I can't imagine a gym condoning the use underage, sounds dodgy to me...
hope everything works out
Nick