Like me @creative_writer - I'm MORE than 'happy' to be alone. But why? Because I didn't seek to be happy living alone. I was satisfied before living alone. Otherwise, as far as I see it, no matter whether one is living along or not, they won't be content. Contentment comes from within? What do you think?
It took me a long time to accept that living a 'happy life all the time' is a myth. Life is a roller coaster. I've finally been able to accept that and re-frame my challenges as room for my personal growth.
This is my personal experience, and to this day, I cannot believe the change that has occurred in my thinking. It wasn't all that long ago that I stewed over similar thoughts as you. The more I stewed over them, the stronger they became.