How can i fix my non - symmetrical face ?

Your face is fine: Bradley Cooper is lopsided. Do you think he cares? So is every other male and female celebrity. Look around you. Nobody cares about a symmetrical face. Somebody's told you something to make you unhappy, and in doing so they did you a grave disservice. People notice how you move, what you can do, how you talk, and especially whether you're fit.