Erection problems

Patient: Hi How do I know if I have damage tissue in my penis? I have masturbated alot in the past 6 months…I just want to make sure I have not cause any shrinkage. Once I know that I have not caused any damage and reduced length, then I will be mentally confident and will be able to regain a full erection. So my question is…how much is too much and how long does it normally take for penis to undergo shrinkage? I am 21 years old. Thanks

Symptoms: Not full erection in stiffness and length