Sadly, this Onion article is spot-on and brutally accurate for most people, or so I'd guess.
I can’t stress this enough: Do what you love…in between work commitments, and family commitments, and commitments that tend to pop up and take immediate precedence over doing the thing you love. Because the bottom line is that life is short, and you owe it to yourself to spend the majority of it giving yourself wholly and completely to something you absolutely hate, and 20 minutes here and there doing what you feel you were put on this earth to do.
Before you get started, though, you need to find the one interest or activity that truly fulfills you in ways nothing else can. Then, really immerse yourself in it for a few fleeting moments after an exhausting 10-hour day at a desk job and an excruciating 65-minute commute home. During nights when all you really want to do is lie down and shut your eyes for a few precious hours before you have to drag yourself out of bed for work the next morning, or on weekends when your friends want to hang out and you’re dying to just lay on your couch and watch TV because you’re too fatigued to even think straight—these are the times when you need to do what you enjoy most in life.