Hello. Very Good evening. I'm Dr.Yogesh Kr Sharma.  first of all using steroids for enhancement of performance is illegal in all country. There is a huge list of sideeffects of steroid users. If you use steroid at this stage,  I assure you 200 %,  you will be impotent after 4-5 years of age,  say when you are 20 years old. Do you want this, & you don't care about being Impotent and this would be irreversible and have no treatment. Please use your own Natural power given by the almighty God.i hope you will take it seriously or consult a Sports medicine Consultant,  who will repeat the same words. Take care. Life is precious. Bye.