This. Exactly my experience. When I was younger, porn talked of 12" cocks and never really mentioned girth. From my perspective, my cock looked similar sized to most I saw in porn. There were plenty of monster examples that convinced me my cock was average.I had received compliments from partners on my size and for YEARS I thought it was just flattery… and since I’m not around any hard dicks as a straight male, all I saw was porn and assumed my size was about average.
It really wasn’t until a few years ago that I accepted the size was unusual. So funny and good to hear others were in the same boat.
I remember when the Pamela Anderson and Tommy Lee video came out (yes, I am that old). Everyone was talking about how big his cock is. I saw the video and thought it wasn't special, a little on the thin side.
My girlfriend told me she was a little frightened when she saw my hard cock for the first time. I thought she was just trying to flatter me and I did not accept what she was saying at all.
It was only a few years ago that I realised my cock is big and I am statistically in the top 1%.