ANSWER:

You must obey your father as you can’t marry without his permission. If he has rejected many good proposals before like this man, you can complain to the Muslim court and they will assign someone else to be your guardian. 

I got to know an arab man and he is interested in marrying me and so am I. His family proposed for me in a very respectful way, and are willing to cooperate in all ways for my family to accept. Butmy father is making it difficult saying that I must marry a paki.And he says Allah will not question him for refusing here as prophet muhammad(saw)married fatima to Ali so family is preferd.Please advice