Success wasn't guaranteed in the ancient world either. Even if you were cultivating crops, a drought you couldn't control could wipe out your crops. Or baddies could invade and steal your stuff and kill your people en masse.
Overall, we have way more security than the ancient world did. Droughts are still a problem as the western US has been seeing, but at least we're at a point today where it just means food prices go up rather than food vanishing entirely and requiring migration to other countries or something.
As for stress, largely European workers don't seem to feel the pressures that American workers do, which probably boils down to in part a mix of higher taxes leading to better safety nets as well as generally much more vacation time from work. Also politics in European countries generally isn't as polarized, though by no means is it perfect.
Farming as a necessity didn't happen until late prehistory and early history. Before that people hunted, fished or foraged for their daily food. They had nothing worth stealing or killing for or that couldn't be rebuilt quickly after an earthquake or other disaster. In the worst case they could just move a few miles away. Dying from a drought wiping out your crops or from being attacked by raiders from the mountains or from a warlord or pharaoh that claimed to rule over you didn't happen until later. Even then your own life was still simple to understand: being a farmer or shepherd or what have you.
I don't mean to say this was all perfect, but instead that when we talk about the stress of modern jobs, we should go beyond saying no one likes deadlines or bosses, because the real problem is the, for some people literally daily, uncertainty.
Overall, we have way more security than the ancient world did. Droughts are still a problem as the western US has been seeing, but at least we're at a point today where it just means food prices go up rather than food vanishing entirely and requiring migration to other countries or something.
As for stress, largely European workers don't seem to feel the pressures that American workers do, which probably boils down to in part a mix of higher taxes leading to better safety nets as well as generally much more vacation time from work. Also politics in European countries generally isn't as polarized, though by no means is it perfect.