In this book you could read that "your thoughts are your own and your feelings come from your thoughts and nobody can think for you and you may have feelings but it's ultimately your thoughts about it that matter and that you control so you control how you react to everything and anything under the sun, thus your feelings are entirely under your control and your responsibility. Isn't that liberating ?" You are a musheen, Harry.
Being exposed as a kid to this kind of reasoning can distort things. It was written by an adult and read by adults.
There's a lot of coaches out there who still put out those kind of reasoning. People try to behave like cold machines and then they break down.