Thanks for your query. Based on the facts you have posted it appears that after all necessary investigation you have proved to have Hypogonadism
.Currently you are taking Testosterone
supplements.You are indulged in doing masturbation
frequently.Let me make clear that masturbation will not have any ill effect on any organ and your sexual potency in future
As regards the size of the Penis i would say that there is no medicine that can increase the size of the penis.If you get hard erection you will not have any problem in enjoying your sexual life.