have I gone slightly mad?

I have noticed I talk to myself more often, now that I live alone. Though I know that all people tend toward this behavior, I am astonished at how often I do it. I have been sitting at my desk balancing my checkbook and updating my budget spreadsheet, musing about myriad ways to pinch pennies in order to pay all of my regular bills, while still feeding myself and my cats, all the while deftly chipping away at my credit card debt. I have been sitting at my desk running through this laundry list --aloud-- and assuring myself that I will be able to accomplish this goal! Has living alone caused my grip on reality to loosen just a touch? Am I slowly going a little mad, or am I not alone in this?