What you are referring to sounds a lot like immature high school cliques...
Groups are normally good, and necessary...
Such as construction workers, a group of people getting together to build a skyscraper...
A lone man can't do that...
Also, a sense of community is very important to most people...
Friends, family, neighbors, all of that happy go lucky crap, working together to make a more pleasant place to live...
Religious groups give importance to find those who share your moralities and beliefs...
A group of friends are those who share your interests...
Political groups are good for......um.......I'm sure something!
Groups are needed for exploration, survivability, building, protection, and to fuck some shit up if the need arises...
And not all conformity is bad, people... you need to give a little to get anything done in this world, but these days everyone is busy being unique special little snow flakes to push in any way that could even be considered progress, and what is considered progressive is NOT DAMN PROGRESS! But that's a rant for another time.
Maybe you are not a group person, that's fine, neither am I... I like to spend my free time with a quiet night at home with a cup of joe, and a good game, or movie, but its also handy to have a bunch of people on speed dial to help move your couch.
Sounds like you are young, don't worry, these tight lil herds of uppity gigglers usually grow up when they enter the real world, and have reality pimp slap some common sense into their ideological heads of theirs...
I WROTE A BOOK FOR YOU!
/dismantles soap box
/use wood to make awesome fort