In C.S. Lewis' writing The Inner Ring he discusses groups that people are affiliated with and what those groups represent. He explained how these groups are everywhere; how some are small, some are big, and how some groups are within other groups. Each group has their own thing that they only know about.
People will sometimes change their actions to get into one of these groups. C.S. Lewis raises the question if anyone is ever happy with what they did to get into that group. I think these groups can be a good thing sometimes. Some groups motivate people to work hard so that they can join the group, such as military groups or academic groups.
We need to understand that these groups are not everything. When people become too consumed with what your group is doing they loose sight of what is best them as an individual.