This happened when I was about 4 years old... My brother, who was about 1 yr. at the time was getting a bath from my mom. I accidently walked in on them because it was almost time for my bath. I then saw my brothers parts, and I saw they were different than mine. I thought there was something wrong with me because I didn't have a penis. And I actually thought if I started doing boy things, then I would "grow" one. Then my mom explained that I'm a girl and my brother's a boy, and that boys and girls have different parts. So, I learned about the difference between a male and a female at a really young age.
A childhood belief about rude bits

others believed things like this
- When I was little I thought girls had "man parts" as well, but it just took longer for them to grow.— person
- When I was a kid, I thought you could get arrested if you accidently walked into the wrong restroomAnon
- I thought that the difference between girls and boys was that girls have teeth.
Anon - i thought that when it was your birthday you grow and then you didn't grow until a years time.— hello
- I used to beleive that when I took a bath w/ my brothers, that if they peed in the water I'd get pregnant.— SabB
- I used to think that when I was in the bath I shark lived under the bath and that ig might come up and bite me— ------------