My parents decided to educate me early about my period, when I was seven. I didn't quite understand it though- I thought that girls got it only once, and it lasted for 28 days. A few years later I found out the truth and I was quite pissed off.
A childhood belief about periods

others believed things like this
- I thought that 1983 went on for 3 years - had to ask my sister who decided how long a year lasted.— Sally
- i used to thought that period is when you pee like a baby for a few days...— i'm totally weird
- I used to think all wars lasted only 4 years, like college or something. Anon
- When I was a kid, I found out about a womans period and I thought that she would bleed through her breasts.— Michael
- For many years I didn't understand why everyone was talking about the 'youth in Asia' (euthanasia).Anon
- I used to think that oral sex was talking about sex. I was wrong when I found out the truth.Anon