Sophie’s world by Josvein Gaarder and unbearable lightness of being by Milan Kundera.

Read these in my late teen rebellious age, made me introspective and really emo (read: pretentious and annoying) and gave me a philosophical lens and human psychological lens in my relationships with others and with the world.

May not be typically mind-blowing books as they are, but coming in that time in my life, it shaped my world view.