weltschmerz: its the depression you feel when the world as it is does not line up with the world as you think it should be.
John GreenImagining the future is a kind of nostalgia. (...) You spend your whole life stuck in the labyrinth, thinking about how you'll escape it one day, and how awesome it will be, and imagining that future keeps you going, but you never do it. You just use the future to escape the present.
John Green