Stay natural. I can go into a sleuth of reasons why but I'll assume you're a smart kid and do as Dabuff said, and stick with the basics.
Any Pro-Hormone, Designer Steroid, or AAS should be taken off your list. Natural T boosters may be more along the lines of what you're looking for. As dabuff said, you're T levels are high as of right now, but you can still benefit from unbound test/free test manipulation. Activate Xtreme, THRUST, and Primal Male are three that I would all recommed and are safe for your age.
Aside of all supplements, you need to get your diet in check ASAP. If your diet isn't good, your gains wont be either, no matter if you're taking AAS or creatine. Dirty bulking will leave you fat.