I guess it depends on your social circle! Obviously if you tend to hang out with Asians 80% of the time then it is pretty hard for Caucasians(just for example) females to feel...attracted because, well, totally different lifestyles!
So hang out more, reach out more just to know people of more different backgrounds and ethnicity. You are living in Australia, which is where i'm from, and my experiences tell me girls there are much more acceptable to mates of a different ethnicity.
Keep it up! Just don't try to become a person whom you are not, delibrately forgetting your roots is a big no-no, i think, cos that just makes you a...'whitey-wannabe'? haha