I loved reading the books. Monster Manuals, the class books.... I enjoyed reading the short stories in them. Never could find a good group to play with - I knew some people who did but they didn't play it "right" in my opinion.. mostly they sat around rolling up new guys and complaining if they didn't have at least 3 traits of 19.
BattleTech I also loved reading.. I think I had all of the "Technical Manuals" for it. Couldn't ever find anyone to play that with either, but I did play the heck out of MechWarrior series on the PC.
Lazs - I think more "normal" people than you think do that sort of thing. I actually was involved with the SCA for a couple years (which is basically LARP without the "magic" stuff... just grown men dressed up in "armor" beating the hell out of each other with bamboo sticks). I really enjoyed it, and at 23-24 was by far the youngest member of the group I was with (mainly guys in their 30s and 40s ... married, making good money, and raising kids). When I decided to go back to school I didn't have the time to do it anymore, so I gave em back the armor that they'd gathered up for me, and they passed it on to another younger guy.
I think I'm about as normal as the next guy, and I've dabbled in the geek arts

. Played football and chess in high school too.