Resilience isn't a trait you're born with, and you need to train yourself to handle challenges and bounce back from disappointments, writes Kate Buller, an executive coach. Learn to critically evaluate stressful situations to determine whether your anxiety is warranted and decide on a course of action. "It's not only about self-confidence. ... It's more about optimism, emotional intelligence, adaptability, and keeping one’s head when under pressure," Buller writes.