I was working out with my first trainer ever: an old guy with a hunched back who was a personal trainer at the Y. He had about 50 years of experience as a personal trainer and loved what he did. I worked midnights for The National Center for Missing & Exploited Children and when I got off shift in the morning I would go to the gym first and then have a half hour commute rather than going home straight from work and have a two hour commute. Usually we spent the morning with him laughing at me for yawning during our session, but one day he had something else rather important to say to me. He told me that I was too focused on what other people were doing and I needed to stop it or it would impede my progress. I needed to put 'horse blinders on' and then go on with my workout.
Comparing yourself to others is not the goal and never should be. The goal should be to love yourself. The goal should be to find out what your limits are. The goal should be to push yourself to reach whatever goal you set for yourself.
If you're too focused on others you're going to lose track of yourself and you're going to lose sight of the goal you've set. So, do you. Put those horse blinders on. Focus on your goal, and get to work. Your hard work WILL pay off.