I used to believe that 'blanket' was pronounced 'blanklet' until I was about 10, I was very embarassed when my mum finally told be the correct pronounciation.
A childhood belief about speaking

others believed things like this
- When I was younger I use to think that my blanket would protect me from every danger in the World — Maxence
- I used to believe that monsters couldnt find me or hurt me if my whole body where under my blanket— Scared shitless
- i used to believe that 'island' was pronounced 'is-land' instead. I know im not alone on that one! :)
— Da KornMeal - I used to think that New York was pronounced "Yew Nork"Anon
- when i was little i used to think bumble bee was actually pronounced bumbow bee— cathy
- I used to believe that L-M-N-O-P was 1 letter, pronounced elemenopeeAnon