Tell them your name is Hong Kong Phooey.
I'm reminded of a story about a minor bureaucrat who was attending a big state dinner, and he was asked to accompany a distinguished elder official from India, you know, sit beside him and be sociable. The guy had no idea what to say or even how to talk to somebody from India, but he assumed the foreigner didn't know how to speak english so he spent most of the dinner being awkward. When the orchestra started playing he made a feeble comment about "Tra la la... good eh?" When the food came he said, "Yum yum yum... good eh?"
When everybody was through eating and it was time for somebody to give a speech, the official from India bowed to his awkward companion, excused himself and went up to give a speech in perfect english. Then he sat down again, turned to the minor bureaucrat and said, "Blah blah blah... good eh?"
Only other thing I have to observe is, don't let other people's confusion about racial stereotypes determine what you are or what you think you should be. You can be british and talk like a hoodrat, and you can be asian and act white. "People of this physical appearance act like this" is all stereotypes anyway. Let them be confused. It'll give them something to puzzle over.