Question: who was charlie writing to in perks of being a wallflower movie?
Answer: an unknown recipient

The story begins with a quiet, sensitive 15-year-old boy named Charlie writing letters about his life to an unknown recipient.  Charlie chooses that person because he said that he heard the person was nice and thought that this person would not be judgmental. He discusses his first year at high school, grappling with two traumatic experiences from his past: the suicide of his only middle-school friend, Michael Dobson, a year before, and the death of his favorite aunt, Helen, during his early childhood.