If boys and girls belong to different communities then the main problem arises related to culture. Both of you will have to adjust with each other. Language problems will be there but it is not a big issue. The boy will learn the Marathi language and the girl will learn the Kannada language. Otherwise, both of you learn the English language which would be common for all. Generally, in such cases, the main problem is related to food and religion especially when families live with them. At this time, there may be chances of fighting and both parties try to dominate over each other. Anyway, I would suggest you before marriage you should consider all the above points and consult family members as marriage is life long relationship. After marriage, if the problem starts then you would not do anything. One important thing, you should keep in mind is that physical attraction between a boy and a girl happens for short period. After marriage, both of you handle different responsibilities. That time, you would be capable of handling the situation. Especially, after childbirth, which culture would adopt your child? You should also think about the problem related to child. Without considering any points, you go for marriage then your marriage would be hell.