When I was younger I would watch TV and see those commercials for those pads that girls use when they are on their period. I thought that girls had to use them because they couldn't hold it when they had to pee.
A childhood belief about periods

others believed things like this
- I thought that the difference between girls and boys was that girls have teeth.
Anon - I used to believe all babies came out as girls and later on in life some of those girls turned into boys — Tom
- I was horrified when my first period arrived. It wasn't blue, like in the commercials for sanitary towels.— Jane
- When i was younger i thought that the left testicle carried boys and the right testicle carried girls.— Ed
- When I was younger I thought that if I ate Gusher's, my head would turn into fruit, like in the commercialsAnon
- When I was little I thought that only little girls had nipples, and they went away when you grow up. — Cutie