Why don't we fall through the floor?

boi ... We got structure and support such as beams and things holding us up.

Because your electrons repel other electrons. For example: the reason you don't fall through your chair when sitting on it is because your electrons from the atoms in your body repel off the chairs atoms. Fun fact: you technically have never touched anything since the electrons repel other electrons, which means we're all floating in mid air because of our electrons repel off of others!