Well..the caste thing may not be a big deal to our generation but it is a BIG THING to our parents. And, the way we are brough up, it's always hard to go against parent's will. Putting myself in your shoes, I would have tried to convince my parents for some time. Things get complicated when you are caught up between your heart(gf) and your mind(parents). I know it's hard but it's the best deal avalable. I won't go for marrying her and then deal with parents later which might add bitterness in the relationship with parents which you don't want to do. There goes my two cents. :)