"At one time, I actually overheard three or four of my colleagues at work all agreeing that 'men with small dicks should be made to wear a sign warning women,'" he said.
Describing his only sexual experience, with a "very attractive university student", he said it had a devastating impact on his self-esteem.
He said: "When I stripped, she stared at my micropenis, giggled, and put her hand to her mouth, muttering simply 'OK' in a tone that suggested she was taken aback."
Despite trying to please the woman, he said she did not appear to enjoy the experience and eventually "huffed in an annoyed way and got up".
Afterwards he said he felt sorry for her so he walked two miles to her home to deliver a box of chocolates "to show both appreciation for her intimacy and also as an apology".
But he later regretted the gesture which made him feel like a "loser" and felt like "she deserved better".
The experience has put him off getting physically close to a woman again.
He added: "If I started to look for love, it would just make me feel down, and I already struggle with depression and anxiety secretly.
"I don't need the humiliation and hurt that looking for love would bring me."
Calling on people to take the body-shaming of men more seriously he said it should be treated in the same way that it is when women are the victim.
Citing Ilma Gore's Make America Great Again painting - which features an image of Donald Trump with a micropenis - he said it was "treated like a punch line rather than an attack".
He questioned whether it is "fair" to dismiss a man based on his penis size, adding: "I just wish people could look past it, so I could too."
