I used to think that women's periods only lasted during teenage years, and once we girls became women, the periods stopped and we would never have to wear pads or tampons again.
A childhood belief about periods

others believed things like this
- i used to believe that women wore bras because their periods happened in their boobies.Anon
- a male friend of mine used to think that only women who had been pregnant had periods— oiman
- When my mom was a child, she thought that while girls had periods, boys had hemorrhoids!Anon
- I used to think that tampons were meant to absorb women's urine so they wouldn't have to go to the bathroom.— Koyaanisqatsi
- My friends son thought tampons were for mufflers for women so that they wouldn't fart. Anon
- I thought pads sucked blood from women. It wasn't until later in life that I knew their actual purposeAnon