As a couple others have shared, I used to cancel on people. Ask me Tuesday to do something on Saturday afternoon, and I used to say "sure!". By the time Saturday morning rolled around, oh you can bet your butt doing anything and being around anyone was the last thing I wanted to do. So I simply stopped making plans altogether. I've pushed a lot of people away and grown very distant over time. My couple good friends I have left understand my issues, though I suspect it still hurts them that I don't ever want to talk or do anything.