Let your body finish growing naturally, your glands are just starting to produce their share of natural Testosterone, so why mess up a good thing, if you eat right,get pleanty of protein and train your heart out theres no reason you won't grow like a weed, I trained a subject just like you ,he followed my advice to the letter well 3 yrs later he went from a punty 145 to 257 lbs, yeah! you heard right, all of this was done natural, you gotta let the body develop so that you will accomplish magnificent things, steroids are not a magic pill, I have to creditidentuals to back everything up i say.