If working has taught me something, it's that <i>every</i> job is "selling your time for a living", including entrepreneurship of any kind (selling your time to your clients, not your boss, but it's not different), and unfortunately that's a necessary evil if you want luxuries like a steady amount of food, clothing or shelter. Also, that <i>every job is a day job</i>, or becomes such after not many months. If you don't think so, you're either deluding yourself, a very boring person without a life, or extremely lucky (and remember, no matter how much do you believe this last option represents you, it's still extremely unlikely).<p>Also: don't fall into the "be passionate" trap. Be passionate about your life, and don't conflate your work with your life. Keep your job out of your life, and if possible, consider yourself unemployed from 5pm to 9am.