Just guessing here, but I'd bet you're a leftie.
The business of handedness is interesting though. I have five siblings, two of whom are left-handed (both female), the rest of us (all male) are right handed. Our mother was left handed as well. I am so firmly right handed that my left hand isn't much better than a flipper for most purposes, it seems to have about half the strength and dexterity of my right hand, and my right hand and arm are noticeably larger than my left. But I also play a guitar, which requires fairly complex left handed movements, and while I'm no Eric Clapton, I ain't too bad at it.
Has anybody researched handedness? I'd be interested to know if any non-human critters display handedness like we do, or if anyone has a clue what causes it. I suppose I could google.... but I'm feeling lazy tonight.