As runners, we all know pain.
We have waged war between our mind and our body, when it hurts so much that you start to justify why you should slow down, how it's OK to let go. The best runners are those who aren't afraid to give their best, even when that may not be enough to win.
At the end of the day, no matter how many people you beat or what time you run, what matters most is how you feel about your performance. You know how you handled the pain and if you did your very best.