Hi
Sorry to hear about your situation, who is being racist towards you? are you male or female? and what ethnic group are you? the answers to these questions will probably provide a clearer picture to the motive of there racism towards you.
usually I find people are racist because as they feel threatened (irrationally mind you) I have noticed in HK that if you have a darker skin the people tend to stare not 100% sure why I guess it is because there are not so many darker skinned people in HK.
I'm a white guy and i myself have faced some racism, usually the women treat me well in HK but sometimes the guys are not so polite especially if I’m out with female Chinese friend(s), your skin colour can not be changed and neither should it be, sometimes it is difficult to change peoples minds, for now unless it is spoiling your life I would try and let it wash over you, just ignore those type of people, they are not worth your time anyway.
Good Luck
Dan