It bothers me when I have to deal with depression and anxiety. I have this friend that doesn't do jack shit. He's been living at home as an agorophobic for like 10 years. He just gets on the internet, games, and sleeps. His social contact is limited to talking to his parents maybe once a day. Yet I'd say the person is not severely depressed at all, maybe only mildly with some anxiety issues. Can someone explain this phenomenon?