If you are a 'lefty'
left handed
Being left handed means that you are one of hundreds of millions of people around the world who do things with their left hand which most people do with their right hand. For example you may write with your left hand, and hold a bat or throw a ball with your left hand.
There are almost 9 times more people who are right handed. As a result most activities, tools, sports equipment etc have been made for right handed people and 'lefties' often have just had to manage as best they can…until fairly recently.