I tend to use mainly my right hand, so I guess I'm a righty, but that's more because as a child my mother insisted on my using my right hand.

In reality I tend to be just as comfortably left handed as I am right handed. And now that I walk with a cane, I use my left hand more and more (I get more support when my cane is in my right hand).

I guess that means I'm supposed to be ambidextrous. Although if you see my handwriting you may wonder if I'm actually using my feet!