I was born left handed.  However, like a lot of kids born way back in the 1960s, they switched me to right in school.  My left has always been my strong hand, and if I need to, I can still sort of write with it. probably wouldn't take very long to get used to using it again.  I broke my arm when I was 12 and for 6 weeks I had to use my left for school.  It wasn't too bad luckily.