Years ago I was driving to a gig with a fellow musician and he was telling me that he was nervous about seeing his new girlfriend at the weekend because they would probably go to bed for the first time. He was worried that she might think his cock too small. To my astonishment he said, " I'm only ten inches when I'm fully erect ". At first I thought he was being ironic and having a laugh but then realised he was serious. He really was worried about his ten inch cock being thought of as too small. Beggars belief sometimes doesn't it?!
By contrast I knew a guy years ago ( another musician friend ) who really did have a small knob. At puberty he didn't develope properly and for the rest of his life has to have injections. His full erection was about the size of a little finger and that chap had no problems about it. Just accepted it. He was sexually active and had a regular sex partner.