I used to feel depressed and empty, not wanting to do the things I normally loved. Video games were too much work compared to sitting on the internet all night, and watching great shows was a hassle. Work was the same thing every day, just slogging through with no advancement, not getting anywhere and being generally unhappy doing it. Then I completely ruined my life. After losing my future, I discovered I'm excited by driving very fast, and might have pursued that interest as a career if I had the chance. I also acquired a girlfriend, which I would be very excited about if I didn't already know it won't end well at all.
I guess if I had to give you advice from my experience, I'd say mix things up and do something different, until you find something that makes your heart race with excitement. Or go see a doctor about it. No good comes from feeling depressed/empty and just wishing for it to get better; it will actually get worse.
