When I was little and still had no breasts yet (I'm a girl), I had no idea what the those nubs (the nipples) were for. I kept trying to either rip or scratch them off, but I wasn't able to no matter how much I tried. When I started growing breasts, I freaked out for a bit and tried even more to scratch my nipples AND breasts off. To understand my panic back then, I had really wanted to be a guy badly back then and I hadn't been told about the whole reproductive stuff yet.
A childhood belief about rude bits

others believed things like this
- I used to think that the shoulder blades were actually "back breasts".— Kdees
- When I first started to develop my breasts I thought it meant I was producing milk— trisha
- I used to think that when you made food 'from scratch', that scratch was an ingredient like starch.— Aynsleigh
- I used to believe that all my energy "came from my nipples and my back" I literally said that to my parents.— Eleanor R
- I used to believe that babies came from between/underneath the breasts.Anon
- I used to believe that womens breasts was actually called apples.— Cailynn