These are the profound questions that all intelligent and sensitive people ask at your age. At 60 I guess I think I know the answers, but they are not glib and not easy. To be a human being is a great gift given to us by the long and painful process of evolution, as Shakespeare wrote:-
What a piece of work is a man! how noble in reason!
how infinite in faculty! in form and moving how
express and admirable! in action how like an angel!
in apprehension how like a god! the beauty of the
world! the paragon of animals!
But being Shakespeare and seeing into the depths of human experience he prefaces this great speech from Ham;et with:-
I have of late--but
wherefore I know not--lost all my mirth, forgone all
custom of exercises; and indeed it goes so heavily
with my disposition that this goodly frame, the
earth, seems to me a sterile promontory, this most
excellent canopy, the air, look you, this brave
o'erhanging firmament, this majestical roof fretted
with golden fire, why, it appears no other thing to
me than a foul and pestilent congregation of vapours.
Recognising that life is not always easy, that to play the part of a human being in a cruel and callous world is not always easy. Then finally Hamlet says:-
And yet, to me,
what is this quintessence of dust? man delights not
me: no, nor woman neither, though by your smiling
you seem to say so.
Sometines it is true hat the world can seem to be a pointless place, but ultimately we must make our own meaning of life, to live trying to be the best possible human being hat we can. So my advice is to spend your youth finding out exactly who you are, try evrything and don't be frightened of failure and once you have a good idea then follow that idiot Polonius's advice:-
This above all: to thine ownself be true,
And it must follow, as the night the day,
Thou canst not then be false to any man.