In Anne of Green Gables there are many quotes about growing up.
"Matthew dreaded all women except Marilla and Mrs. Rachel; he had an uncomfortable feeling that the mysterious creatures were laughing at him." Chapter 2, p.11. In this quote, Matthew is going through that awkward phase of trying to figure out the opposite sex.
"'You don't want me!' she cried. 'You don't want me because I'm not a boy! I might have expected it. Nobody ever did want me. I might have known it was all too beautiful to last.'" Chapter 3, p. 29. This quote is about growing up and finding one's place in the world.