Questions on quality of existence

Standing at the watershed, today looking forward
not so far away into the future,
I can see the river of life
take a plunge in to the unknown-
death, life after death, end or
new beginning who knows?
One thing is certain, I will not exist
As I have in this form, ever-changing as it is,
from that moment onwards.
Standing here at the watershed, today looking backward
Over the twists and turns
That the river of life has taken,
How would you evaluate my existence?
Am I a sum total of my achievements, successes?
Or am I a sum total of my failures?
The sum total of my efforts?
What I have done for myself?
What I have done for others?