I can't marry girl who understand me - loves me..Intercaste issue

i love a girl and she loves me too. we both belong to different caste and my parents are not ready to accept this love marriage. they say that our society will look down upon us. If u marry that girl than we will not talk to you of see your face again.
But i know that she is the girl who can understand me and care me as no one has done till now and will never do.i m in relationship with her since 3 yrs and now i dont want to separte from her.
I tried to convince my parents with all possible way but they are not ready to accept. They have only one thing their mind that no inter caste marriage.
And as the girls parents are in favour with a condition that my parents should accept her, so now she is not ready to go against her parents and do a court marriage with me as this will make her parents insulted .


Now i dont know wht i should do?

Please help me out