When I was a kid, I was aware that "gender" was the word for if you were a boy or a girl, but that's the only word I knew for that. So in first grade when we took a standardized test for the first time, there was a space that said "sex" and I knew I'd never had sex before so I wrote "no".
A childhood belief about speaking

others believed things like this
- In first grade, I thought that if I've never heard of a word before, then it wasn't a word.— Destiny
- Up until 8th grade or so, I was convinced that I invented the word "Fart"— Jonah
- I used to think the word fever was just another word for giraff— Marshall m
- I used to think that "boobies" was a bad word all the timeAnon
- I once knew a girl who used to believe that the sun was actaully a really bright gold fish very high up.— meow
- When I was young, I heard the word 'minion' for the first time and thought it was a miniature onion.— Karin