That's an impossible request! What sort of books do you like? Horror? Science fiction? Fantasy? Romance? Drama? Thriller? You can see where I'm going with this! The types of books you like to read in your own language will be the types of books you will enjoy in English.
Why don't you find an English translation of your favourite book? When I was learning Spanish, I found that it was very helpful to read a book I had read before (in English). That meant I already knew the plot, the characters etc and I didn't have to look up every other word. I could remember the basics of the story so, much of the time, I could make a very good guess at words or constructions that I wasn't completely familiar with.
Not necessarily self-help, but certainly non-fiction. Something like "127 Hours" (film of the same name) where a guy's arm is trapped under a rock in the middle of nowhere would certainly fit "challenge" and "positive attitude".