I am a muslim boy and I am in love with a muslim girl.few days back I came to know that boyfriend/girlfriend relation is haram in islam that's why we both decided to perform nikah.but her parents don't want her to marry me because they think I am not rich and not from a good caste background.please provide your valuable suggestion as per shariyah,are we allowed to marry against her parents will when the only problem is that I am not rich,