Hmmm.... Well I am not married neither am I in a relationship but what I can tell you is to go to God in prayers. Speak to God, table down your matter before God. Let him lead you and direct you on what to do. This is the same problem we face in Africa. Even in a Christian home (in Africa), we experience tribal discrimination. Parents saying you can't marry or date a particular tribe or race but one thing that has worked for some couples here is prayers. Eventually, the parents tend to shift grounds after prayers and pastors' advice. So, don't stop praying and seek the help of a good pastor to talk to your parents on your behalf. Nothing is impossible.....