existential crisis?

i'm too young to die
i'm too old to live
the wheels are still turning
i've naught left to give

my heart is so full
as i sit here alone
my friends have been many
i'm still on my own

i've built such great castles
but none that are seen
dreamt dreams beyond counting
not sure what they mean

what's left as i ponder
how fleeting life is
isn't held in a hand
or won through a quiz

i may not have mattered
in the grand scheme of things
still this one truth i know
He's worth all life brings