I, too, have always been "bad at anger". That doesn't mean that I don't get angry. I certainly do. But my anger leaves a strong aftertaste in me which it takes me a long time to get rid of. It is as though I am ashamed of feeling this emotion. The "something pitiful" which the protagonist in this book feels is something which resonates with me, because I also tend to find quite legitimate excuses for the behaviour in people that has provoked my anger.