> What do you mean, Nature isn't kind to humans? Because we aren't immortal?
Something like 90% of Earth's surface is outright deadly to humans: about 71% is covered in water, in which humans cannot survive; then there's deserts (both hot and cold) as well as high mountains, which also don't allow for human habitation without technology.
But it's not just geological features. There's also deadly diseases, lots of predators (humans wiped them out completely in most of their habitats), weather and poisonous plants.
The average urban human wouldn't survive long in nature. Heck, there's a good chance they would catch a serious disease just from drinking contaminated water from a pond or a small brook.
> If Nature wasn't kind, how did we make it for those hundreds of thousands of years?
For hundreds of thousands of years there's only been very few of us. In pre-argicultural times, no more than 10M humans lived on the planet [0], probably even almost going extinct in the wake of the Toba supervolcano event 70000 years ago. Indeed several genetic bottleneck events have been identified (ice age, weird cultural shifts [1]) suggesting that the survival of our species wasn't a sure bet throughout history.
[0] https://www.census.gov/data/tables/time-series/demo/internat...
[1] https://pubmed.ncbi.nlm.nih.gov/25770088/