I used to believe that "G" was a vowel. As far as i was concerned, vowels were letters that could make two noises. At that time, i thought they were just called the two-soundy-letters. I first found this out at the age of 6 and believed it until first grade. I was sad when i found out it wasnt.
A childhood belief about reading

others believed things like this
- From the first six letters of this word, I thought that “megalomania” had something to do with megalodons.— Enrico
- When I first started learning to read I was convinced that vowels were called barnacles.— Andy Howell
- I used to think "Zed" and "Zee" were two different letters.Anon
- I used to believe that translating from language into language was only a matter of changing letters ! :) — EwS
- I believed that pigs could actually fly. I'm 13 and found out this year that they can't.— Boy I'm Blonde
- I believed a star that I later found out was the planet Venus was the Tooth Fairy— Jillybean