Hello sir I m 23 years old. I notice that my penis

Patient: Hello sirI m 23 years old. I notice that my penis didn’t get that Much powerful erection as it did so before. Still it erect with great power, but it gets down after. During sex time, I felt that I m not getting my that best power which I had. Pls help me to overcome from this. I do masturbate sometimes is may the reason for this problem…

Doctor: