I have good friends, loving parents, people I can rely on, I am doing decent in University, I have amazing coworkers at work. But for the past few days, I don't know why, but all I do when I am home is lie on my bed doing nothing. I don't have the motivation to study, play games, watch movie. Nothing. I just lie on my bed, listening to music with lights off.

I workout, go to classes, go to work, make people laugh, socialize and finally when I return home, all I feel is emptiness.
Just plain and simple emptiness.
I don't get it. Everything in my life is going positively. Why do I still feel empty, depressed?