You need to develop a more relaxed attitude toward riding. Maybe even avoid certain areas of the forums...
Try embracing attitudes as expressed in other areas of cycling, like those you will find here:
http://www.3speedtour.com/
You don't have to ride a three speed, just adopt some of the attitudes.
I don't know how old you are, but maybe read some of the threads in the Fifty Plus forum, and go for a pie ride... take a ride to a nice pie shop and enjoy a piece of blueberry pie.
When you ride, enjoy the journey.
Of course, if your objective in cycling is to go fast, these things may not appeal to you, and this advice is meaningless, but there is a chance that there is an aspect of cycling that you are missing by being concerned about those faster stronger riders...
When you are out for a ride, don't forget to stop and smell the roses, or listen to the spring peepers, or look at the sugar maples turning red...
Maybe you will even get to the point that when you ride, you will look at the beautiful buildings and nature around you and feel sorry that those fast cyclists aren't able to see it as well as you are.