When I was a child, I never really was clear on the idea that there were only two genders. I thought that there were an infinite variety of anatomies for people, and that "male" and "female" was kind of a organizing word, but had no real meaning. My parents would tell me I was "special", and I thought that meant that I was anatomically different from everyone else. So when they got around to telling me about real human anatomy, genitalia and what not, I had a real hard time accepting it. I couldn't bear the idea that all females had the same parts, and that all males had the same parts.
A childhood belief about rude bits

others believed things like this
- I used to believe that boys were like robots and had no real feelings, that they were not even real people.— Lisa
- That unicorns were real. They simply had invisible horns that only people with special eyes could see
— Katie - I used to think that to desex an animal meant to turn it from a male to a female or female to male.— Phil
- I thought that all cats were the females, and that the dogs were the males.— opps guess not
- i used to believe dragon ball z was real
and namek was in another dimension
and every show on tv was realAnon - i used to think the word "friendship" meant a special kind of rocketship that you went on with your friends.— chips ahoy!