When I was 3 years old, I thought that you could switch genders as you grew up. People with dominant personalities would become male adults while people with passive personalities would become female adults.
A childhood belief about getting older

others believed things like this
- i thought split personalities were like having dreams. the dreams i had were all my personalities!— Odd Dreamer
- That adults came into the world as adults and were never childrenAnon
- I used to believe when adults grew up only 4' 9" or lower are still classified as kids.— Jorge
- I used to think that to desex an animal meant to turn it from a male to a female or female to male.— Phil
- That boys turned into women when they became adults and girls turned into men when they became adults. Anon
- I used to think that I was smarter than adults. Now I know kids are smarter than adults in many ways— Marshall M