If by mature we mean respecting tasks and duties, why don't we count duties to your own psyche and body into it?

Being an adult is sometimes finding some occupancy that with minimum amount of time will give us the psychological comfort to do the maximum amount of paid work through the rest of the week (or day). Why don't we teach kids that being mature is caring for our needs too, instead of pushing them into the square hole of just duties that are demanded of them by everyone else.