I just read this belief
I used to believe that St Pancras station was actually St Pancreas. It wasn't until I was corrected - at age 21 - that I realised what I was saying...
I'm 38 and have just had a belief shattered!
A childhood belief about trains

others believed things like this
- I used to belief that if you stood behind the TV, you would appear on the screen.— Gen Rodenis
- ı used to belief I thought astronauts could see GodAnon
- I used to belief that if you bought a car you needed to put it togetter yourself— Bugs
- I used to belief that the crusts on bread had more vitamins— mims
- I used to belief that farmers had to kill the cow to get the milk.— Juan
- When I was little I used to belief that my clothes shrunk systematically, instead of me growing...— Nico