I am going to pick a few for this one. I get an excuse because although I feel like I haven't read nearly as much in my life as I have wanted to, I did obtain a literature degree and I am going to be a librarian so this one is extra tough to narrow down.
My two favorite books are One Flew Over the Cuckoos Nest by Ken Kesey and Fahrenheit 451 by Ray Bradbury. Honorable mention goes to The Outsiders by SE Hinton and Matilda by Roald Dahl. All very famous books which makes me feel odd, but they all really affected me emotionally.
As a child I read a ton. I was constantly staying up all night reading, went through books like M&M's, and was way above my reading level. This kind of mellowed out in high school when I was forced to read material I had no interest in. When I was in college I read lots of novels for class, but only the occasional book on my own. I still feel like I am not where I was as a kid in terms of reading. I wish I had that insatiable appetite for books like I did back then, but I guess the world has changed and so have I.
Matilda was the first book I remember reading over and over. I really connected to it for some reason. Perhaps because I felt like an outsider, maybe because the timid title character had so much power, or because it was just so clever. This was my first reading love (Spot and Clifford books don't count) and that is why it made the list. I know I must have had this experience before I read The Outsiders, but this is the first book that I recall crying over. I bawled through the last chapter and still get a little choked up when I hear Nothing Gold Can Stay. One Flew Over the Cuckoos Nest is arguably the only book I liked in high school. Although now that I think about it, I was big on Eugene O'Neill and Arthur Miller plays as well. Either way, I had never read anything like this novel and it inspired me in a way nothing else ever had. Despite the tragedy of this book, it is uplifting and really timeless.
I didn't read Fahrenheit 451 until a few years ago. Once I read it I was kicking myself for waiting so long. If you only read one book in your life, you should pick this one. It is easy in terms of language and I immediately wanted to recommend it to my 12 year old brother, but I don't think he is ready for it thematically yet. I shouldn't assist a pre-teen into being that jaded already. Fahrenheit makes a bleak commentary on society. I have observed in my short time in this world that with every change in technology and shift in generation, people project this books commentary on the world. Although they think it is exclusive to their generation, this book shows otherwise. I mean it is a dark book and looks at the negative parts of people, but also ends with a lot of faith in the world through the works of the individual.
So there are my favorite books, no spoilers really so you can check them all out if you haven't already.
But don't take my word for it :)