4 Answers:
Who says “Why do I exist?” is the most important question of everyone’s lives? Something is never just important in a vacuum. It can only be important to someone. Those people have agency to decide what is important to them.
I have considered the question, and I’ve dismissed it as unimportant because knowing the answer wouldn’t change anything for the better (at least as far as I can imagine). Beyond that, it seems like an exploding question: in some sense, if the universe “just is”, there’s no a priori reason for me to exist except for the boundary and initial conditions of the universe (and even then, maybe not); we could go so far as to say that I exist because my parents had sex, resulting in me (which reduces to the previous outlook); maybe, if there even is a purpose, it’s not for me to know; maybe my reason for existing is to find out exactly why I exist (how meta: existing only to find out why one exists!); maybe my reason for existing is to help someone else figure that out; or prevent it; maybe I’m just a pawn in some infinite-dimensional game; maybe my purpose is to affect some particular thing in some particular way so that some other particular person will affect something else some particular way so that… eventually some particular outcome will result in ten thousand years; maybe my purpose is to be weighed down by considering all the possible reasons for existing; maybe it’s to encourage other people to stop; maybe this; maybe that; maybe the other; or something else!
How the bloody hell am I supposed to wade through this morass and figure out (a) what all the possibilities are, (b) which ones to discard, and (c) how the hell to do that?
No thanks. I’ve decided the reason I exist does not include seeking specifically to find out precisely why I exist. Maybe I’ll stumble on the reason by accident - and hope it’s something palatable. For now I exist to stop procrastinating on Quora and mark assignments so I can get home before stupid o’clock (if it’s not already too late for that).
I think most people, intelligent or not, know why they exist. Because their parents got involved with some hot n’ steamy relations at some point.
Probably because they know that humanity is no where near to finding the solution to that question. So meanwhile, we may as well enjoy the work whatever we are good at and keep contributing.