Were your feet born equal?

After wearing all types of shoes for many years, i have just discovered that my feet were not born equal. after a careful evaluation, i have discovered that my left foot is one-half inch longer than my right foot. i have always used my right foot as a measurement for new shoes and now i know why i have problems with my left foot and not my right. one-half inch can make a world of difference in some shoes. am i alone with my unequal feet or is this normal for most humans?