Hi.. i can totally relate to your situation. I have a girlfriend, who was exactly in your condition. she is from upper caste family and i am from lower caste, but we love each other very much and can not live without each other. Her parents are very protective and thats why she did not tell them about us, as she knew that if she tells about me, her parent might try to hurt me or her and she has 2 younger sister, its gonna impact them as well. Her parent found someone for him..whom she did not like but she had to marry him. This 20th she got married and she could not do anything for me.. I am just telling you all this because being a victim of this i know it hurts very much and i myself is seeking some help from this platform and trying to move on. So i am requesting you that you try your best to convince your parents, but if it is not possible to do anything then please inform your boyfriend about it as soon as possible..Don't let him suffer, cause it hurts a lot seeing someone you love go away from you. Our Indian society is like this only,i don't know why parents think that love marriage is wrong or interstate marriage brings disrespect to family. Disrespect comes only if you do bad things. The only thing everyone wants to live happily, but due to this mentality no body is gonna get happy. It will just ruin 3 families life. your's obviously, your boyfriend's and also the one who you will marry cause if you love your boyfriend you can never focus on him. I felt totally helpless in my case cause there is nothing i could do. i can give you one suggestion if it works, try to find as many couples in your surrounding(preferably relatives), who have done love marriage and tell your parents that even after doing love marriage they and their families are still happy and they still have there respect. It just the mentality which creates all these issues and i think mentality can be changed only by letting the person know that love marriage are not big deal. two matures are taking there life decisions. parents have full right to know about who their child is gonna marry but at lease they should consider there children's choices, without keeping any discrimination mentality.
I wish you a very good luck. hope things work out for you. it did not work out for me..i hope for u and you boyfriend it works. best of luck.
one thing i want to share more from my personal experience is that try your best but if it does not works don't keep your hopes up cause hopes give you very hard time and it hurts you a lot. i am not sure if i am right or not. but i think for me keeping hope till last time, that some miracle will happen and god will do something and i will get my girlfriend, it hurts me a lot. cause when you don't get what you want, it hurts a lot.
OK friend best of luck to you and your boyfriend and if there is something which i typed here which hurts you i am really sorry for that.