any advice...please??

Assalaamu alakum, I'm sorry to bombard you with my personal problems but I have no one else to talk to and would appreciate any advice.
When I was 16 my parents got me engaged to a guy who I didn't know very well at the time- but i went along with every thing cos i trusted my parents. After I got to know the guy i realised my parents were right and i have very much fallen in love with him. We want to get married but my parents wont allow it (even though they chose him!), you see I have a place in med school and if i get married now i wont become a doctor (cos i'll have to move abroad) and this would bring great shame on the family :roll: .
What should I do? marry him and destroy my parents dreams? or spend 5 years doing something which i really wouldn't enjoy?
help...