Born a leftie but changed to right-handed. Would my life have been different?

That same thing happened to my mom, her teachers in grade school forced her to use her right hand. The only difference your life would have would be that your right side of your brain would be a lil more "stronger" or "more coordinated". But if you still use your left hand for certain tasks, consider yourself lucky; your brain is "physically fit" by being able to use both sides :)