I wish to stay single.
Sure, I like getting together with friends now and again; some of us have an outing planned for this Sunday involving brunch, for instance. But at the end of the day, when I get home, I love the fact that I am alone. I need solitude on a regular and recurring basis in order to maintain my sanity. It wasn't until I was 21 that I had a girlfriend, and the reason I eventually broke it off was that I felt she was too demanding on my time -- She wanted me to spend more time with her and I already felt I was spending too much.
I'm over 40 and fairly set in my ways. The thought of having to share my living space with another person is a very uncomfortable one. So I remain single, and like it that way.
The only difficulty with that is the people who think there's something wrong with wanting to stay single, or insist that this will change. When I was 30, the library I worked in at the time, one of the librarians scoffed at the idea that I'd remain single, and said she'd be willing to bet that by the time I turn 40 I'd be in a stable long-term relationship, if not actually married. (I should have taken the bet. I would have won. Would have been an easy five bucks.)
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"Some mornings it's just not worth chewing through the leather straps." -- Emo Philips