Awesome true story by Roshni ko jyan. Everyone in this thread had literally suggested you to go ahead and take a chance. I think not a bad idea, atleast you will know what she really think about you if you tell her truth. She might say yes or she might say no. If she says no , chances are there are two reasons. One she only see you as good friend or she cant hurt her parents feeling.  Atleast you could move ahead with your life and find someone else who is destined for you. But the real turn around is possible if she say yes. Even if she say yes then there could be possibiltiy of two end result. One is happy and other is tragic. Happy ending if she  break all the caste barrier and rebel againts her parents or managed to convinced them that whatever she is doing is good for all.

Now i have one real doubt even if she is affirmative.  Are you sure that she will be able to fight for your love cause and happy marriage with you, againts her parents wish. I have one friend of mine in USA, who was deeply in love with girl in nepal of different caste. Their love story ran for seven long years and at the end the girl just couldnt make decesion whom to choose, her beloved love or her strict reputated family member. The guy moved ahead with another girl in USA coz her gf had no courage to go against her family.

So think about this scenario again. Just getting positive answer from your proposal doesnt mean that you won ur long due of battle of love. However i do suggest you that you should tell her everything truth and get the answer. Just make sure that she would be able to stepped out of her family wall in case there is problem. Thats all i wanna suggest. U truly love her. God bless your true love. Good luck