What, you forgot about the massive population of poor the world has, western included? Or how many in the western world eat crap, because it's easier than making things for ourselves? Height is largely determined by what your parents feed you, once you're able to be on your own you're essentially fully grown. I know a decent number of people whose parents were either relatively poor, and they subsisted on mac & cheese frequently, or were largely idiots when it came to food and raising kids. And many of them are noticeably shorter than average. My wife, for instance, is just barely over 5 feet, and her family-then-single-father fell into both categories until he joined the military.
As to the second... I have absolutely no idea where you get that idea from. Maybe everyone around you weight-trains outside of the gym frequently, or you've never done so for an extended period of time? You're absolutely nuts, though.