Try to talk to her parents either yourself or through your parents (as suggested). If they dont agree then if you two still want to live together do whatever is best which may also include running away...but that should be the last option.
And since you are born and brought up in Qatar and I presume you have been staying here all your 23 years, dont get carried away by the myth that for siblings it can be a problem if you run away...marriages in India are no more like that, not for even that many years as you put your age to be.
Try to talk to her parents either yourself or through your parents (as suggested). If they dont agree then if you two still want to live together do whatever is best which may also include running away...but that should be the last option.
And since you are born and brought up in Qatar and I presume you have been staying here all your 23 years, dont get carried away by the myth that for siblings it can be a problem if you run away...marriages in India are no more like that, not for even that many years as you put your age to be.