Theme of my litature analysis book

I am reading The catcher and the rye. And so far I have noticed a very deep theme which is loneliness. Holden's behavior indicates his loneliness he doesn't really know why he behaves this way. He often sabotages his own attempts to end his loneliness. For example his conversation with Carl and Luce and his date with Sally are made unbearable by his rude behavior. He is a really individual person who has a source of his security.