Why don't you want to continue to study biology?
If you are really interested in physical anthropololgy, you can apply for that. But, personally, I think it is not only tough but also boring.
I am doing medical anthropology.
And I am afraid it is easier to find a job when you study biology.
You are also welcomed to study physical anthropology because you can probably be the first Chinese I have known to study it in the U.S..