at 5'7 and 17years old I was bigger than you due to a big caloric diet and hard training without any supplements example creatine,whey,multivitamins or aas, but hey if your gonna do the cycle regardless then its trial and error and go hard with the test prop,but dont expect to be doing all them sets you have in mind let alone train 100% cause without a base you wont have experience and strengh to overcome injection pains, but whatever I see it alot now a days just kids juicing and getting plump then back to being small fatties and not training as much in other words just a bunch of wanna be toys!