I am a loner. It gets easier when you get older. Just today, I told a co-worker why I wouldn't go to her daughters pool party. I told her I was really looking forward to spending this weekend alone in the house as I needed it for my sanity. If you want/need to be alone, be alone. You are in charge of what you do. Don't feel bad about it.
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I go about my own business, and keep my mind on myself and my life. I expect the same courtesy from the rest of the world.