Congratulations!!! Group rides make for great fun on the bike. They are my absolute favorite :-)
I wish I could say the same thing for indoor trainer rides. Unfortunately, they are probably the least fun to be had on a bike, but a necessary evil in places where the weather makes riding outdoors in the winter impossible. Indoor training can, however, be excellent for building strength/fitness, so keeping that in mind will hopefully make it easier for you stick it out when the going gets tough!