Who- why- where are we ?

Well, maybe in one sense they are good and important depending on how they guide your life - in a good way.
But you are right also that in the grand scheme of things, at the end of the day, well, Iā€™m not sure here. They may matter a bit. lol
But I agree that we ought not to be holding onto them too tightly - but loosely ā€“ or not even that. Just to be the skeptic, the agnostic.
At the same time, is it right and true to hold some things as truth, even if they are our own truth and they do not interfere with the truth of others or harm them?

Being stoic is a good thing. Being a nihilist though, that would depend on how pessimistic that nihilist is.
I like to think of myself as a more refined nihilist. lol