I have one. First observed at age 6 that my penis was much smaller than those of other boys my age. A urologist MD, when I was 25 and not in his office for anything related to penis size, told me that I have a micropenis, first time I'd ever heard that term. He used the word "infantile" to further describe its dimensions. My scrotum is also very small.
When it came to social and sexual situations, it certainly has posed some challenges, but few things in life are ideal, and most of the unpleasant situations related to being so under-endowed happened between age 11 and age 28. I no longer hide it, and have found nudists to be extremely accepting people.