Everyone's depressed, empty, useless -- when stopping to consider one's life instead of simply going about the business of living it.
Really, think about it. Or better yet, no, don't -- it'll only make you feel the "slow nothing" that is apathy, a harmful downer thing that lurks between the living moments like a bloated blah-troll. Sort of like when you put the movie on pause and go to use the bathroom -- generally unrewarding, as experiences go.
I won't insult your intelligence and tell you to cheer up. Perky people grate on everyone's nerves (unless you are having your own perky moment, in which case, shoo!).
So what's the solution?
Simple. Keep looking for it! It's all in the movement. And yes, it exists.