What fiction made a big impact on you? For me, I happened to stumble on No Country for Old Men in the local Library - I was at that time a huge film watcher so I'd never heard of Cormac McCarthy - the book bowled me over. It opened my eyes to the power of literature.
A Clockwork Orange movie version when I was about 24. The ending made me realize in order to get thru life easier you've got to play the game, sad yes I know. I read the book and the ending was different, really a mediocre ending. The author hated the movie directed by Stanley Kubrick, claiming it ruined his novel.
When I was 8, I received the complete works of Shakespeare and Edgar Allan Poe. Took me a while to get through them all, but they made an impact.
When I was about 12, I read "Children of Morrow" by Helen Mary Hoover.
That was when I started understanding the concept of a dystopian society, and genetic manipulation.
Deep stuff for a 12-year-old, but it stuck with me.