Penis Size

Patient: I’m a 22 year-old man and, over the past few months have noticed a decrease in the length of my penis shaft when flaccid. I only started masturbating at the beginning of last summer. I take pre-workout supplements to aid my workout results, but I have never taken steroids.Why is my penis smaller?

Symptoms: Lack of confidence (contributes to a decrease in sexual desire)
Sexual dysfunction
Serious history of prostate cancer in my family (i.e., father, both grandfathers and great-grandfather).