We are all guilty of it, comparing oneself to someone else, without first looking in the mirror to determine who we truly are.
It is good to have someone to look up to, someone to compete with, but at the end of the day it is the individual who can look at their own progress, their own soul and determine if they have done better. There are days where I look at the white board and see a time that I can't even begin to imagine how it was accomplished. A worthy goal to shoot for no doubt. I see weight that has been moved well outside of my 1 rep max, a worthy goal to attain at a later date.
You are an individual, with your own way of accomplishing your goals. You cannot emulate the path of someone else and hope to obtain the same results, however, you can make your own path and develop yourself. Use the competitive spirit to push yourself. Their achievements can be the motivation to push yourself beyond your normal boundaries.
We have spoken of this in the past, to push yourself out of your comfort zone develops you both mentally and physically. It's ability to develop you quickly into someone who can adjust to uncomfortable situations because you have put the stress on yourself - you showed up for the workout and gave it your all.
Take that to heart - regardless of whether or not you get a PR every day/night or use Rx weight every workout, you are starting to transform into an individual who has the ability to persevere through the toughest of times because of something that you want.
"Instead of comparing our lot with that of those who are more fortunate than we are, we should compare it with the lot of the great majority of our fellow men. It then appears that we are among the privileged."