The Martian Chronicles at age 11 is what did it for me. After that I read everything I could get my hands on. Heinlein, Clark, Niven, Burrougs, I had to read them all.
LOL! You're a sci-fi junkie, too, eh?
I remember I, Robot by Asimov. What a memorable character Adam Link was!
I find 'normal' fiction and non fiction rather unexciting when compared to a good sci-fi / fantasy story.
How about you?