If I understand India correctly, in the south of India, cousin marriage is permitted. Even so, I would assume it is still not the norm. That being said, I will also assume there is not a history of marriages among cousins in your family. If that is so, and there are no genetic problems in your families, even on the sides not shared, (Your Father, her Mother) you should be fine. If however, there is a problem, even on the "other" sides, it could be an issue, even if you were not cousins. Since you want advice, I would say if you two love each other, do what you must to be together. If you do get together, and decide to have a child, I would encourage you to see a genetic counselor. I may get slammed here, and it wouldn't be the first time, but have you considered not having children? I don't have any, and neither does DW, and we are perfectly happy with our life together. Also, as young as you are, I wouldn't be in the biggest rush anyhow. She has several years she can wait before that becomes a potential problem for a child.