A clique isn’t just the stereotypical group of mean girls that is portrayed in pretty much every movie or book about high school. 

Everyone generally has their own clique, a group of friends that you hang out with mostly. Even some of the nicest & most social people have a tight group of friends who they enjoy hanging out with.  Along with that, no one is asking you to be best friends with everyone. Sometimes there are people who you might not like. This being said, no one would discourage you of going up to someone outside of your own ‘clique’. 

A lot of times people will see someone alone and judge them, thinking ‘why don’t they have their own friends to hang out with?’ The next time you see someone who doesn’t have anyone else, you could invite him or her over and find out that you have so much in common with him or her. Even though the minimum of how you should treat another human is with respect, being kind to other people will get you so much farther in life.