In big trouble - convince parents for inter-caste

i am in big trouble plz help me.. my boyfriend parents are against our marriage. my boyfriend is jain and i am brahmin. specially his dad is so much against our marriage. he never met me but he thinks that i dont deserve to be in their family. my boyfriend cant able to express himself in front of them. they always say that we dont want to discuss anything about that girl. people of this so caleed samaz around them told his dad that she is not a girl for your family. plzz tell what to do????????????