Hiya, I totally agree with Son. My cousin got married to a white girl, and although it was tough for his mother initially she learned to deal with it. Because in the end, which parent wants to loose their son. One bit of advice I can give you, is learn as much as you can about the culture. The reason why Asian parents have such a hard time accepting things like pre marital sex or even dating is because they feel, living in a Western world their children will loose the fundamentals of being Asian. Culture, personal discipline are the most important factors to our parents. If you enter their lives and demonstrate the fact that you embrace these values and understand why they`re important to them, you will automatically gain some ground in building a relationship with them. Either way, you seem like you`ve got your head screwed on, go with your gut instinct and your heart. Starting a life with someone is never clear-cut and easy, give it time n patience. They`ll come around, u may never have the ideal relationship with them, but you have to work at it for you and your partners happiness and future.
Just a couple of questions, have you met his siblings? or cousins? Also, ask your boyfriend to introduce you as his girlfriend. N tell him to be honest with his folks. How old are you both? In the end the more you conspire about this, the more tension n stress that will be inflicted on your relationship.
All i can say is take it one step at a time. Goodluck.