Ohhhhh... where to start? OK, to really narrow it to "life-changing" books, I have to limit it to the following:
Twelve by Nick McDonell
drug addiction, violence and sex among wealthy Manhattan teenagers. Twelve is the name of a drug is much like a cross between cocaine and ecstasy.
The Catcher in the Rye by JD Salinger
holden caulfield. teenage confusion. angst. sexuality. alienation. rebellion.
Extremely Loud and Incredibly Close by Jonathan Safran Foer
nine-year-old boy named Oskar Schell searches for information about a key that belonged to his father, who died in the 9/11 attacks.
Night by Elie Wiesel
novel about Wiesel's experience with his father, Shlomo, in the Nazi concentration camps at Auschwitz and Buchenwald in 1944–1945, at the height of the Holocaust.
Pride and Prejudice by Jane Austen
Novel dealing with manners, upbringing, morality, education and marriage in the society of early 19th century England.
Bright Lights Big City by Jay McInerney
Unnamed main character- a writer who, by day, works as a fact checker for a high-brow magazine and By night, he is a party-goer, a cocaine user, seeking to lose himself in the hedonism of the 1980s yuppie party scene, often going to the nightclub Heartbreak.
I'm sure there are about a dozen more, but I have to limit it to these few. Read them. They'll probably change you as well.