Well, at least someone is asking and trying to learn not just jumping in blindly without asking questions. Many of us probably tried different things we shouldn't have at too early an age. Speaking just for myself, I did.
Like the others stated, taking roids too early in life can alter many things which are going on in the body. Wait until at least 21-22, and train hard and eat right...there is alot of potential at this age with no drugs.