If you're unhappy where you are -- maybe, where you're living, or where you're working -- take a look around. It may be that you're there *not* for you, but for you to help someone else. You might be really needed.
Not that you shouldn't try and change your situation. But if the change just isn't happening, or is taking a while, look deep into the faces of those around you. The single mother next door, the quiet coworker. You might be sent there to help them through a difficult time.