When most people talk about feeling asian or 'black' or 'white' it's about the specific societal expectations or consequences of being that race. That is also tied to your phenotype: what you look like regardless of how you identify or your blood quantum. It's obvious that a mixed race person is likely to look less asian (and be less intellligent) than a monoracial person, which causes that the societal effects of that are likewise moderated.