Bro, at 16 you have twice as much Testosterone, and Growth Hormone floating around your blood stream, than those of us on gear!!
At 16, it's like being on Gear!! You should be able to get huge naturally over the next few years. put the work in.
Besides taking roids at this age will completely screw up your natural
Test levels.
Lift like you mean it. Read everything on training. Don't just do what some fat old frustrated gym teacher tells you.
Perhaps spend your money on a professional trainer for Bodybuilders.
By the time you hit 21, you'll look better than most of us!!!