Well I write with my left hand although I am not considered to be completely left handed. I remembered doing a test once and it asked loads of questions i.e which hand would you throw a ball with?
I throw with my right hand. Kick with my right foot. Used my left leg as lead when hurdling. Hold a tennis raquet in my right. Play guitar with my left. Use scissors in my right. Use a knife to cut bread etc with my left although I hold a knife at the dinner table in my right and use a spoon in my left. Pick a cup up with my right.
At work I use my mouse with my left and at home with my right.
I could go on and on and on .....
Incidentally I started school in 1961 and was never forced to write with my right hand then.