If あなた really could dig a hole to China, and あなた did, and あなた fell in, would あなた stop in the middle because of gravity?

Assuming that あなた did dig through the center of the Earth, yes.

You'd melt, and probably evaporate, and heat rises, so.... :S

Plus the magma in the mantle would rise, cool down to a solid, expand, and you'd just land on very hot lava.

There's a center of the Earth?
I thought it was an alien spaceship.

#doctorwhoreferencesareawesome

Yeah, あなた would. I read this awesome book called "Tunnels" in one of the later, they are at または near the center of the Earth and they are weightless. i asked my Dad about it, and he 発言しました that yeah, あなた really would be weightless because the mass of the Earth is pulling あなた in every direction.