"The Purpose-Driven Life" by Rick Warren made a really big impact in my life when I read it. Sounds cheesy but when you get to pick up this book at a time when everyone is against you & at a time wherein you can't fight the demons inside you this book is the perfect read.
If you feel lost & in doubt don't hesitate to pound on this one. It brought light in my life. I believe it will do the same for you.