He did. He wrote it down in his diary. Less than 15 minutes in.
View: https://youtu.be/2CmCxcdhGcI?feature=shared
After that he stopped talking about. Only talked about it on Forums and found what he read very distressing. He thought the average was "4 inches"
He also spoke about "not measuring up" or "I never quite measure up like other boys". Also "women looked down on me as an inferior man."
Its obvious that he is was no bigger than 4 inches. He was also the shortest kid in his class growing up. He was also developmentally slow. He completed puberty later than average.