Sallinger’s novel portrays a troubled teen in New York

Sallinger’s novel portrays a troubled teen in New York, is thoughts , and adventures .
Over the course of the book, Holden’s unhealty mindset is displayed by his few interactions with various people and his sometimes questionnable actions
His mental states evolves a lot and eventually, by the end of the novel, he has a complete mental breakdown.
But why and how is this boy much more angry and depressed than a normal teenager his age ?
« “That’s the whole trouble. When you’re feeling very depressed, you can’t even think.”
« “Anyway, I’m sort of glad they’ve got the atomic bomb invented. If there’s ever another war, I’m going to sit right the hell on top of it. I’ll volunteer for it, I swear to God I will.”
Holden as an evident lack of self control, he often says and does things on a whim, without really thinking about the consequences that could eventually follow.
For example : when his younger brother Allie died, he broke all of his garage’s door « just for the hell of it », even though he can not expalin why he did it he says : «it was a very stupid thing to do, I’ll admit, but I hardly didn’t even know I was doing ».
An another sign of his evident depression is that he seems bored of everything, he hates everyone and doesnt really pally himself in the things he is good at like litterature for example.
Moreover, he’s a compulsive liar and he says so himself.
He will tell lies to somebody for no reason, no purpose : “I’m the most terrific liar you ever saw in your life. It’s awful. If I’m on my way to the store to buy a magazine, even, and somebody asks me where I’m going, I’m liable to say I’m going to the opera. It’s terrible.”