Braving the Wilderness: the quest for true belonging and the courage to stand alone by Brene Brown is a universally appealing book. Who hasn't felt like they did not belong at some point? The short of it is pretty simple, to feel like you belong you have to be yourself. The book touches on other topics related to belonging like self-worth, anxiety, and depression. It's part personal anecdotes and part research. It's a delightful read (or listen! It's read by the author).