How is Holden Caufield immature?

I think that Holden is stuck between teenage angst, some clinical depression, and his own intellect. Holden is able to see the hypocrisy of the world yet doesn't have the maturity to put it all in perspective. He is still an adolescent caught in his raging hormones and teenage malaise. Holden is looking for outlets for his angst while trying to comprehend truth and honesty. Holden doesn't yet have the maturity to understand the many shades of wrong and right that makes us all so human and so fallible. Holden is a budding existentialist caught in the body of a teenager.