The perks of being a wallflower characterization

Charlie is a protagonist in the story.
He cried about his friend's death a lot in the first letter. He even screamed about it.
"Especially in that office because I was crying still. I never did stop crying," (p,4).
"Then, I started screaming at the guidance counselor that Michael could have talked to me. And I started crying even harder,"(p,4).
When Charlie doesn't stop asking what is up with his aunt, his father slapped him and Charlie cried.
"I don't remember much more than that because I started crying really hard..."(p6)
From these quotes I guess he's very emotional.