A childhood belief about rude bits

For a long time, I thought boys didnt get penises until they were 10 years old. I thought before that, the body had kind of sucked the penises inside, to incubate them until they were ready to fall out. (This was because I had overheard my mother talking about a boy's testicles "dropping" - because he'd hit puberty, but he was 10 at the time, so it was early.)

As for me, I thought I would turn into a boy, so I was waiting for mine to "drop" too, thinking that my vagina was just the wrinkle, where my penis was sucked in.