the saga of darren shan, by darren shan
HARRY POTTER!!! they are super awesome if you haven't read them you should. even if they ARE meant for kids, i got my dad to read them and he actually likes them. i see 17 year olds in my school walking around with the books, so they're not that childish.
the hunger games, maybe, but those are girly, depending on whether you like them, and i forgot to check whether you were a boy or girl hehe
the sword of truth by terry goodkind! they're pretty adultish, and relly hardcore fantasy. they are AWESOME.