When my brother had his sex ed at school (aged 10 I think, so I was 7) he came home and decided to share some of his newfound knowledge with me. Looking back now, I can see that he'd been told about puberty, and when it starts and what happens, but he'd either got a bit confused on one point or he had decided to wind me up.
Either way, he told me that nobody knew if they were a boy or a girl until they were 12 because that's when they start changing into a man or a woman. I was absolutely terrified for weeks that when I was 12 I would suddenly find out I was a boy and not a girl after all. In the end I decided to tell my mum and she sat us both down and put us straight!
A childhood belief about getting older

others believed things like this
- I used to think that your birthday changed every year, and that your parents just decided what day it was.— Daniel
- i used to think that freckles were when god got bored and he decided to draw on your face!— kelsey
- when i was 4 i believed i could breathe under water, one day i decided to try it and woke up in the hospital!Anon
- I thought that 1983 went on for 3 years - had to ask my sister who decided how long a year lasted.— Sally
- My dad told me that when he was little, he thought the trees waved back and forth to make the wind blow.— casey
- When I was younger, I saw Madonna's video for "Material Girl". I thought she was singing "I'm a Cheerio Girl"!— Greg