I fought hard but…

I fought hard, but lost;
I needed to fight;
And I fought really hard;
But didn’t win;
That was when I learned
My lesson once and for all;
You must not win
Because you’ve fought hard;
At times, you fight and win;
At times, you fight and lose;
That’s life;
Fight hard;
But know you might win,
And you might not win.