I am in love with a boy of different caste.Society creating trouble in marriage.

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I am in love with a boy who doesn't belong to my caste.And i surely know that our marriage will have a lot of problems.As my parents are against love marriage and society also doesn't accept intercaste marriage.My boyfriend suggested that I should run away from house and get married to him.But I think that if I do this,it will be unfair to my parents.I want to get married to him but my parents will never allow to do so.Law has already accepted intercaste marriage but society has not yet accepted.If I run away from house,I hurt my parents and if I don't get married to my boyfriend,I will be hurt and my boyfriend too.And if i marry the one, whom my parents choose for me,will also not have a happy life,as i can't give him that love that he may deserve from his wife.What shall I do in such a case?