Y'know, I don't know if this is weird or anything, but I can't think of a single book that I'd say has changed my life. And I know no book has ever made me cry. I can only think of one that has ever made me laugh (as in actually laugh, not chuckle inwardly or something). Generally the only strongish reaction I have to something I read is the "Oh that's cool" feeling when I like an idea or the way something's said.