Ah, that makes sense. It's usually the leftys that learn to switch to the right. I have a friend who got yelled by her teacher because she wrote with the wrong hand so she had to learn to write with the right.
I'm a lefty for most things but I do, out of necessity, use my right hand for stuff too...like I mouse, dial a phone or use the number pad on my keyboard with my right hand. So would that qualify me as ambidextrous?