Since re-discovering the bike in the early 80's, I have floated in and out of too many groups to mention. The curent group I am involved in is a bonafide riding club with jerseys and all the rest of the kit. But this group is different. We have maybe 30 members. Within that group are 4 to 5 sup groups who ride together based on their interests. We have the competitors. The guys who cannot stand having anyone else's wheel in front of them. We have straight roadies. We have straight mtn bikers. But the subgroup that keeps it all cohesive are the rest of us. We float from group to group as the spirit moves us. I might go road one Sunday and then hit a Mtn Bike race the next Sunday. We do night rides. We do urban assault rides. The bottom line is we all love riding and allow each rider to enjoy it as they want to.
So do not sweat the loss of that first feeling you got when you discovered the joy of riding in the dirt. Just keep riding and the fun will find you.