In The Perks Of Being A Wallflower, the connection between Charlie and his friends is the main source of his experience. In Charlie's group, his friends are going through adolescence like Charlie himself. This is the period in which teenagers start to explore their own identity, and friendship gives them the best memories and the strength to overcome difficult times. As Charlie and his friends goes on in life, their bond is what remains.
Growing up
As Charlie goes through his adolescence, he knows that someday we will all sit around as adults to talk about what we should have or should have not done. He knows that this period of life he is in will be memorable, because it is the period in which people experience their firsts, create infinite memories and make mistakes. It is the time when children start to shape their identity and slowly bloom into adults.