'No Longer Human' - Osamu Dazai

I reread it on a whim. It's an old book, but I think it's as easy to read as current light novels. The protagonist is born with many advantages: wealthy family, handsome, humorous, and popular with women. However, due to an innate fear of people, he cannot trust others, cannot accept happiness, and falls into a valley of misfortune. If you feel that you're out of sync with societal values or don't fit in with the majority, I highly recommend you read this book.