At about age 7 I firmly believed I was going to be a world champion tennis player and no one was going to beat me. I don't play tennis anymore.
A childhood belief about sport

others believed things like this
- I forgot the expression "not cricket", so I said, "not tennis" instead.Anon
- i used to think that ozzy osbourne was a hockey player, and i thought michael jackson was a basketball player.— anastacia beeverhousen
- My great-grandfather firmly believed, and had me convinced, that SPAM was mouse meat. — texasblue
- Bronski Beat - Beat Boy
"Meatball
Meatball
Hit that perfect meatball..."— Santa Puncher - Until a few years ago, I believed this was a "doggy dog" world, rather than a "dog-eat-dog" world.— jemima
- I used to think that the Hunchback of Notre Dame was a football player.— Wendy