I just would say this- my husband and I found group riding to be somewhat unpleasant. Too competitive and hectic for our taste. We like to take long country rides and really stop and smell the flowers and hear the crickets and take our time when we please, as opposed to 'keeping up' with anyone. We love to ride us two together, or with a friend or two as well, or often just by ourselves as well.
Consider all the various ways of enjoying biking. Perhaps a little break from club riding would help you reduce stress?