Nearly half of all U.S. workers fail to use all their allotted vacation days, according to a recent survey from Pew Research Center.  The reasons they cite include having too much to do, concern about falling behind at work, and a reluctance to ask coworkers to cover their responsibilities. What’s more revealing to us is what they left unsaid — and often don’t recognize. None of us want to admit that we would rather feel overwhelmed than underwhelmed. Most of us prefer being too busy to not being busy enough. We often experience a greater sense of our own value when we’re working than we do when we’re not. Working is not just a way to stay busy, but also to prove our worthiness — to others and to ourselves. Immersion in work helps hold off feelings of inadequacy, anxiety, loneliness, sadne...