Indigenous people eating their traditional diet don’t really have crooked teeth. Their jaws are big enough to fit all their teeth, including wisdom teeth. They also don’t really have cavities but that’s another point.

For myopia, there is weak evidence that it is caused by lack of sun exposure at an early age.

So, you can blame your parents for giving you a bad diet low in fat soluble vitamins in your childhood, and not making you go outside. Other than that, you can try to prevent it in your own children.

Beyond nutrient deficiency it seems there may also be effects on teeth straightness from bottle feeding (chronically sucking on many types of baby bottles changes infant mouth shape) and from not chewing enough hard foods as a child. The cavities thing is mostly about sugar and to a lesser extent other processed food.

As for myopia the effect is probably due to some combination of lack of very bright light exposure and a infrequent need to focus far away or too much time spent focusing close without breaks. As you say the solution is to spend more time outdoors as a child, and alternate relatively shorter sessions of desk/screen work with more active interludes, making sure to glance around the room with some frequency.