I understand the point author of the question makes (which I suppose is "to recommend one book you liked" essentially), but if I would take it literally, as written, then - no single book ever changed the way I think about everything, or even about majority of things.
The point of the question is not books you like, or books which changed everything, but books which changed you.
If you grew up, as most people did, your world view was shaped by a child's world view seeing a small slice of local life and some nationwide lowest-common-denominator TV/media.
If you haven't read anything which has shaped, changed or distorted that brain you see the world with, you either had an unusual upbringing or you haven't read anything very interesting.
