How can i become an american citizen from australia?

I've seen in movies, mexicans just go over and take a test about american history and stuff, but apparently it's not that simple, and i'm beginning to lose hope seeing as though i need to be a freaking genius with a important degree or have to be born over there or whatever. I just want to move to the US, and live a normal life, not as a professor or rocket scientist just so i can stay there, i want a normal job, one without a huge amount of smarts or responsibility.