I'll be in the minority then, but to me these are my best books.

The Power of Vulnerability by Brenè Brown and Quiet by Susan Cain.

The first is not a real book since it's audio only, there is no written counterpart but it changed the way I see, connect, live in the world entirely. I _never_ found something along those lines.

While the second book, Quiet, although a little boring in some sides, made me accept my introversion (although I don't appear like an introvert).

If I had to pick only one then it would be the power of vulnerability, such a shame it hasn't a paper counterpart (you could read all brene brown books probably and get the same message, but that audio book is so great).