This is the story of one of many.
This one wishes to tell you its tale.
It's just the same as any...
"I am the sum of a million lives,
my work is all from them.
Each entry is a million knives,
to the furious driver at my back.
"My ancestors, I tower before;
to my son I'll be nothing more
than another knife held to his throat,
another body in the moat.
"When all is said and done,
no more shall I be, nor any of my fathers nor my sons.
I'll be cast into the lot thus far done.
I'm another day older than my father, one day younger than my son."
There is a lot of fluff in the riddle. Only a few lines may be generally helpful towards you solving the riddle.
Best of luck, puzzlers-in-arms!