Zac you don't need steriods at your age! What you need is help with your diet or your lifting. Your body is producing enough of its own juice right now. Also you joints just are not mature enough yet and adding steriods to your body will only increase the probablity of tearing muscles...
So read as much as you can but don't be foolish enough to believe that steriods are the answer because at your age they will do more damage to your body and WILL reduce your own natural production of test and other important hormones.