First of all there is no such thing as i am not pretty ... every women is pretty just because she is a women

believe in the that at first. God made us in this way
at every single moment watch for that little voice in your head that says negative things about you and stop it. replace it with a positive statement. no matter what the results are just keep your focus on replacing negative thoughts with positive ones. then what? don't even ask about what will happen just do it and you will be surprised ...
