Have you seen the Ang Lee film
The Wedding Banquet? Compared to the guy in the movie, you have it pretty easy. Unless you've also not told your folks that you are gay and living with a white male physical therapist.
What's really your worst case scenario if you tell your folks you don't want to go to school for the MBA? Is there something else that you could do that you would enjoy while appearing to satisfy their need to micromanage you?