I used to believe the word "privacy" was considered rude, because my parents explained to me when I was little the reason they shut the bathroom door was for privacy. I thought it pertained to something involving nudity, and even after I learned different, still felt odd saying the word in public for a long time afterwards.
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
- I used to think the word fever was just another word for giraff— Marshall m
- When I was young, I heard the word 'minion' for the first time and thought it was a miniature onion.— Karin
- I used to think that "boobies" was a bad word all the timeAnon
- When I was 6 I used to believe my parents were watching me at school on TV. It explained a lot at the time!— opinionata
- Up until I was 10 or 11, I thought the word anonymous was 'annoymous'.Anon