Since you are in NJ you are not that far away from DR overbeck and my self as we deal with these issues. At 21 your dr should have their head examined for commencing TRT with out find out why you are low. Our approach is to find out the reason why you are low and to try to get your body going on its own through manipulation of several factors. We have gotten alot of young guys started by finding out the root cause which can be a variety of issues dr's are too lazy to look into. You would not beleive some of the cause are which actually involves little medical internvetion, but simple suggestions involving lifestyle, and nutrition balancing. PM me.