If you were not always like this, and it is a new thing for you, it's more likely to be a mild case of Apathy as Christina said.

I can relate to your issue at hand since my "apathy" is apparently permanent, but sadly because of that I can't tell you how I would solve that myself. Having said this, I've seen people suffering from this and most of them got out of that state given unexpected circumstances, meaning something you wouldn't think possible actually happening before your eyes, thus giving meaning to your life again.