Childhood to Adulthood

I honestly don't see Holden as a child in this Novel because he acts too mature for his age. I know that he is having a hard time trying to decide what to do with his life. Part of him says that he should screw himself over and the other part thinks he can make it to the real world with some motivation from his parents.He also needs a big attitude change and needs to change his lifestyle and his attitude towards life because in his later years, he will have to face some sort of reality whether he likes it or not