You need to listen.
You probably won't, but you should. You r too young. You have no idea what you r doing. I know it seems really cool to use these things and see a difference quickly. But I would bet anything that, with a good diet, rest, Correct training, supplements and vitamins, u will grow more than when u used the test, and it will surprise u. You need to be 25, and hopefully reach your natural max size.

Holy s@&t, 10-12 months of training. Read, read, and read again. Listen to these guys. You will learn a ton.