About cast system in india?

My problem is very common about the cast system, i m from Punjab i m ramdasia sikh by cast, which comes under SC category, i loves a girl from 3 years and we wants to marry she is KANWAR by cast, comes under general category, belongs to himachal pradesh where the cast system is very common, her parents will not agree to our marriage (according to her) and my brother lives in canada and PR holder, i can go there but she is not ready to leave india. and her parents will also not agree with marriage, if in any condition they agree, 1 more problem is that, they have their particular DEVTA and that particular DEVTA enters in the body of PUJARI G, their parents will then ask question about our marriage and this wl not gonna happen that the DEVTA agrees. In Himachal peoples of Higher classes, so called RAJA, will not even allow to touch the lower class peoples and don't shares anything. Is there any way to connivence her parents, because i can't even live without her and she too, How should we talk to her parents??? should i change my surname to some Higher castes which comes under General category??? or there is any other way, please help me out of this, i shall be very thankfull to you for this, i have 3-4 years in which i will go to abroad and settle my life and also can do something after that i have to talk with her father for marriage, My family is a rich family father is an officer, only problem is the cast, plss help