I READ ATLAS SHRUGGED WHEN I WAS IN GRADE 10,AND IT CHANGED MY LIFE!!!
(had to put that in caps)
after that i became obsessed with ayn rand and read everything I could get my hands on by her. "The Fountainhead", was awesome,even some of her non-fiction stuff.
lucky for me some of my friends were into her as well so we would have long, explosive conversations

man, her philosophy of objectivism reinforced some of the ideals i already stood for and gave them credence and expansion (even to spheres i had previously thought extreme).
this book will force you into difficult moments of introspection, awesome read.