I have nothing against wanting to improve your condition or striving for better - but expecting something just because you were born or a human - really needs some reality checking.
Also your notion that human condition constantly improves through history is not a given - things can very much regress and humanity can disappear.
It's very probable that your highest contribution to society is 9-5 and supporting enough >2 kids - but it's not very popular to say that I guess.
Everyone is entitled to fight for better conditions
>things can very much regress
That was gp's point
Which life is better on the whole? That of an apex predator in its natural environment or that of livestock?
There is a case to be made that modern humans have been progressively turned into domesticated livestock, abstracted from their ancestral, natural habitat since the neolithic revolution.
It is unclear that cell phones and modern medicine increase net happiness when many work soul sucking, unhealthy sedentary jobs and suffer a long gray existence in nursing homes and hospitals.
Stating that life should be hard now because your ancestors had it worse is completely missing the point. They all strived to make life better for their progeny. We need to be doing the same. That means refusing to accept things being worse than necessary.