Gina Trapani writes,

To me, a more interesting question is What do you want to do?. The desire to do anything beyond eat, find warmth, sleep, and mate is what makes us human. Your goals and aspirations, the steps you're taking to achieve them, plus everything you've done to get you where you are right now is the essence of who you are.

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Think of your todo list as less of a list, and more of a map. It's a map of where you are now that points you in the direction of where you want to be in the next few days or weeks. Your done list is the route you've taken in the past few days or weeks. Your projects list is the next few months or years, and so on. Dissatisfaction is the difference between where you are and where you want to be, and your lists are the map plotting the route ahead.

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Not knowing what you want to do is a scary place everyone's been in at one time or another. Working toward a particular thing gives you purpose, and when you don't have that, it can feel like you're drifting, directionless, while the rest of the world is speeding by. When you're in this place, try to minimize the insecurity about not knowing what you want. Take comfort in the fact that many people are speeding toward a place they don't really care about because they didn't fully think it through. Commit to taking the time to find the right direction for you.

The whole piece is rather well written.