I'm 55 years old today, but it was when I was 14 years old when I got teased for having a "man dick" or being called "donkey dick" by other boys that saw me in the showers after PE class. It was then when I knew I was different than the other boys in the penis department, as I was rather tall and lanky and shy but I began to believe that I was like a freak or something was abnormal with my penis.
When I was in the 11th grade being about 16 years old, my dad walked into my bedroom by accident after I had just masturbated, he saw my still hard-on dick and he candidly told me then that I was much bigger than he was as a man... He assured me that I wasn't a freak... During this discussion he volunteered his penis measurement to me that he was a bit over 9 inches erect, but at that time I was a already 9.5 inches long and that he told me that I would probably grow bigger than him as a grown man, which I did see happen for me to end up to my current dick size.
Much later when I was 27 years old, back in 1985 my Grandfather on my mom's side saw me shower after we had been swimming that same day, my soft dick was long and floppy as usual but when he removed his towel to get dressed, I noticed his long flaccid dick too which was very similar to mine... We ended up openly discussing our gene connections and he told me that he had a long one like his father had too. He told me that he was 10 inches long when he was hard - I was kinda surprised that he confessed this to me at his 86 years age. He also said his brother my Great Uncle had a huge one too, and that his Grandfather had a large penis- who had been born during the slavery era. I confessed to him that I was a little over 10 inches long when I was real hard, and that I had problems fucking some women in my life then because of my extra large size... even still to today... and he understood my issue because it was problematic for him all his life as well. I would have never found out this information without a frank discussion with my father and Grandfather concering this topic.
I do happen to be 6-feet 3-inches tall - I'm the tallest male on my mom's and dad's side of my family, many who are 6 feet tall on average. So I believe in some instances there is a possible genetic connection to penis size and height, at least in my case.