21 and in love? So cool... just explore and don't plan for anything :-)
Dude she only wants you coz she wants to get a visa to the US.They all would give an arm and a leg to live in America.Be carefull.
The only challenges that lie ahead is your brittle-mindedness here. If your girlfriend that you truly "love" simply an ethnicity and label to you then you might want to reconsider your love for her, especially if you believe her individuality, interests, and love revolve around these cheap labels and generalizations you assume "challenges" with....