That's happen to me before. It was last December, I would get offered to do things with people, but I just didn't want to, even with my own family. Though I was in a deep depression then, lack of communication with your family(or anyone for that matter) and solitude can do damage to your social attitude. I spent all of my time ont the computer, and even though it brought me peace of mind for awhile, even talking to my online friends became something I didn't want to do. Even if you may not want to, try going out with your family next time. I didn't want to socialize with anyone with that time, and found socializing awkward, but I forced myself to do it so I could get out of the slump I was in. I couldn't just allow myself to get worst, I didn't like being anti-social it took away my happiness. Anyways I hope things get better for you, I don't know if I could make any more relation. :\