I like these sorts of questions Noodley. I can spend hours thinking on such subjects. In fact, it more or less obsesses me!
I spend my life in my head. I should get out more; not 'out of my head' in the clichéd sense, but spend more time living my life rather than thinking about it!
Happiness matters most to me. That, and having a sense of living on my own terms. I have the latter without question (and those terms that are someone else's don't impinge upon me). The former, I'd say I'm pretty darned close to.
My happiness is invariably lessened by dealings with (some) people. I do get overly concerned over disagreements or things going wrong (e.g. my lawn mower breaking down when under warranty!). I know that, in the scheme of things, they are not really important but they do attract far too much of my attention. I wish they didn't but I can't seem to make myself be chilled about it. Vicious circle!