Any books/videos that CHANGED your life? Especially on confidence

I've noticed most successful entrepreneurs have this amazing, underlying confidence in themselves where they've already imagined themselves as going to accomplish success, as if it's inevitable.

I'm looking for something...preferably a book, and preferably non-fiction (but I'm open to all suggestions)...but basically looking for something that illustrates exactly what not giving a damn is like, or suppose to look like, and how to accomplish the things you want in life without worrying so...

Any books/videos that CHANGED your life? Especially on confidence

from Any books/videos that CHANGED your life? Especially on confidence