Stop agonizing over the "obnoxiously unanswerable question" of whether you've found your true calling, writes Cal Newport, author of “So Good They Can’t Ignore You." If you get satisfaction from self-improvement and want to make a difference in the world, there are a great number of careers with which you could fall in love. "Passion is not something you follow. It’s something that will follow you as you put in the hard work to become valuable to the world," he writes.