Love is essential; gregariousness is optional. Cherish your nearest and dearest. Work with colleagues you like and respect. Scan new acquaintances for those who might fall into the former categories or whose company you enjoy for its own sake. And don't worry about socializing with everyone else. Relationships make everyone happier, introverts included, but think quality over quantity.

Quiet: The Power of Introverts in a World That Can't Stop Talking (ed. Penguin UK, 2012) - ISBN: 9780141970172