I have the symptoms mentioned in the posts above and it has been diagnosed as social anxiety. I don't like leaving the house because I am insecure and anxious about all but the most superficial interaction, and I won't say I never make calls, but I have to work myself up to them for days, sometimes weeks . I put them off as long as possible and let others call me for appointments, then get off the phone as soon as possible. I'm sure I sound abrupt.
My New Year's resolution is to be more social and my goal is to make one phone phone call per week and one sustained social interaction per week. I started this week and am already stressed about next!!