Used to believe? I still have imaginary friends! Of course a few years of having them and I got it through my head they couldn't like, lift things or be detected by other people, but there's really no reason to stop believing that they're there.
A childhood belief about imaginary friends

others believed things like this
- I used to belive you couldn't stop growing until you were bigger than godzillaAnon
- when i was growing up i had two imaginary friends. One was named Jennifer, the other was named Onion.— Tessica
- I used to have an imaginary friend named Mr. Nobody. He would protect me from my imaginary enemy, Bad Elmer.— Kdees
- I used to think you couldn't die if you didn't have shoes on. Coincidentally, so did one of my friends.— Casey
- i used to belive that the cotton and the cotton candy were the same things and for this reason i ate both.— tiziana
- I used to belive if someone liftes you up, and you lift them at the same time, you will float in the air.— D'Anthony