I was a very sheltered child (as well as a late bloomer), and even though I had had a "growing and changing" class in fifth grade, I was somewhat clueless about my own body. So when my breasts started to form in middle school, it just happened to coincide with the health class discussions about breast cancer. I was mortified! I remember sitting in the back of the class and feeling like my world was ending. I thought I had breast cancer, even though I was only 12, because the description they gave was "lumps in the breasts." I did not realize, until a few months later when I finall broke down in tears and told my mother that I had breast cancer, that a woman's breasts are SUPPOSED to have tissue growing in them, because that's how they form... I had always thought that they just kind of expanded, like they were filled with air.
A childhood belief about rude bits

others believed things like this
- up until puberty I thought that my nipple would inflate like a balloon to form a breast— EiEi
- I literally thought “oral sex” meant talking about sex until 8th grade health class.— Kai
- When I first started to develop my breasts I thought it meant I was producing milk— trisha
- When we were young, we used to call a woman's breasts, 'Hum Hums'— Steve Haughton
- When I was little I thought that black babies who were breast fed got chocoate instead of white milk.— Susan
- I used to think that the shoulder blades were actually "back breasts".— Kdees