To me it's an odd question (don't mean that as a insult to the OP). It's the default position to be single. How anyone feel's worse off for the default position to me is just strange. In fact the very idea of 'enjoying being single' does't make much sense. To me it's like saying I enjoy having feet which I suppose I do but don't wake up in morning and thing gee wizz I'm really looking forward to another day with my feet.
I understand from reading posts on the Personal Issues forum that some ppl are desperate to be in a relationship and feel bad they are not. I've never felt this way myself and I don't feel like I'm the oddity for being happy with the default position. I've had 2 serious relationships in my llife, one I truly regret ended and indeed miss. But although I regret and miss this is not the same as saying I wish I were back in a relationships just for a relationships sake.
So although I'm not sad or desperate to be in a relation I wouldn't say I'm happy being single either, neither unhappy. I'm just single, that's it. And I do detest this notion that one can't be happy unless on is in a relationship. As long as your getting the ride somehow that is