What would happen if I were superwoman?

     Many people are not aware that the word "if" should be used with "were."  For example,  If I were superwoman,  life would be more peaceful."  A plethora of  people begin sentences with "If I was" rather than "If I were" and so unless it will cause conflict, I  make the correction.  I have heard  politicians, musicians,  and even  radio journalists  make this mistake.