Ask you mother who she would like to betroth you to and then get to know her. Soon enough the girl you were not meant to be married to will fade from your memory. But... only if you allow that to happen. You whining that you can't have a girl that your parents have not chosen for you is only going to keep you stagnated in your want of her. Resign yourself to the fact that a relationship with her is no longer possible and stop falling in love with woman that you know your parents won't approve of. You are your own worst enemy.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion