Then you've read some terribly misleading, romanticized false version of history. Hunter-gatherer lives should not be romanticized as being desirable. They were (and are, in the few places they still exist) incredibly hard, dangerous and miserable existences.

Think of it as the most extreme form of poverty. No clean water, no shoes, malnutrition, limited protection against the weather. Every day going about basic tasks carries the risk for death, disease and disablement.

There is a reason that human population didn't rapidly increase until relatively recently in our collective hundred-thousand-year history. It's because most humans died before reaching reproductive age. Even in the few pockets of the globe with conditions favorable to survival, periodic events (weather, disease, rival groups, over-hunting, etc) wiped out entire tribes in terrible ways.