Close connection ( independent book)

In my novel, " 3 Willows", the characters remind me of many girls my age. I have many friends who have known each other since they were young girls, yet they refuse to hang out with one another because they don't fall in the same social circle. I think that it's a bit childish to act this way.
I don't really understand why social status is as important as it is. When I go to college every person is treated as in individual, so why not practice that in high school? In the novel, Ama notices that she isn't really the kind of person to go hiking in the woods. And the other students around her notices this and still talk to her. They talk to her because they know that social statuses aren't natural, they aren't apart of nature. So why do we all act a if they are?
They was a show on television that went to high schools across America, and expressed to students that we are all alike. The characters in this book should look into finding this show and watching it. Maybe it will teach them a bit about our peers and the hidden connections we have with them.