Burn - Pontzer - Similar to above, with more historical evidence
Haidt - Righteous Mind - What is wrong with the people on the "other side" - it's not about sides, it's about human nature. This is a difficult topic, don't expect easy or quick answers.
---
Not a book, just a few thoughts from my own life about burnout, anxiety and depression:
Negative emotions are Ok, they are a part of life, they are not bad by themselves. When your negative emotions pick up friends - when you get angry at yourself for being upset; when you have a negative emotion about a negative emotion, and it becomes a cyclical, persistent or recurring feeling, consider getting professional help.
I got a lot of joy out of just trying things and seeing what happened. If it succeeded or failed, I learned something. Somewhere along the way, I lost the joy of discovery. If you have lost the joy of discovery, consider changing something about your situation, and possibly getting professional help.
A lot of the things we say about mentality are descriptions of the human experience, not mechanical or causal elements in the mind. Procrastination is not a cause for delaying tasks, it is just a description of delaying tasks - it is not one thing, the same way plastic or cancer is not one thing. There are many elements and many causes, and you have to address those things, and not the procrastination.
Willpower is similar - people talk about willpower like it is a substance that is used up to motivate decisions. That is a human experience, but any particular decision has it's own motivations. If you have consistent issues with a type of decision, look into your motivations and deeply held beliefs, look into the elements of that motivation; defer judgement about yourself during this process.
These things about mentality can't be conveyed with words, your mind has to come to them on it's own, but hopefully reading this will make the ideas more available to you.