I usually have to think about it, too. I blame my mom. She's a writes as a lefty but does everything else with her right and has a terrible time with directions. I always have to pause and think about which hand I right with. If I'm giving her directions in the car, I have to say turn your way or turn my way.
Sometimes I worry that I will suddenly lose the ability to differentiate left from right and the subsequent rejections will end my turking career.