I have a son your age who is a stellar athlete looking at a full ride scholarship to play lacrosse, and we discuss the use of AAS often. I have educated him on the effects of use at a young age, and he knows that this stuff is NOT safe at your age. PLEASE take the time to research this stuff to understand what happens to your natural system when you introduce AAS, it is simply not worth it at your age. Eat like its your job, train hard, and get 8 hrs of sleep at a minimum. You will grow. At your age, your natural test levels should be some where around 1500, that is a good target for someone older who is using AAS. You see my point?? You are already extremely primed for some serious muscle building.
Now get to the gym and work your ass off until you puke, then get up and do it again tomorrow!!!