If you allow your father to control who you marry, you will be allowing him to continue to control your life forever. He will probably never approve of ANY man you choose. He is using emotional blackmail. I suggest counseling to help you untangle this dysfunctional relationship. You are an adult now and need to realize how destructive your dad is. you need to make your own decisions. Again, I suggest therapy. Are you still living at home? Can you move or stay with someone else? As children we are supposed to be raised to be independent. your dad wants you to be dependent on him....probably forever.