A childhood belief about places

I don't know what category this goes in, so I'll put it here. I used to believe that the earth was flat and no matter how my parents tried to convince me I always held firm in my belief that the earth was flat. Whay, I sure didn't see any curves? Not only that, but why aren't people in China falling off since they are supposedly "down" from us? Or people in Antarctica, they aren't down or up from us but on the globe they are down. So why don't they fall off? Eventually Dad convinced me because he is a Physics teacher and knows all about that kind of thing... hahaha. Boy, was I stupid...