I don't think you should go around telling people you identify as white. Just tell people you are multiracial.
It's every man's own choice how he identifies himself. I used to sometimes say Irish, or Dutch, or Czech. The other nationalities were too insignificant an amount in me. And I realize that's not racial, but a similar situation.
Nowadays I just say Northern European, a mutt, a Heinz 57 as my husband calls me. And I kinda like that. Because I kinda like me. Not great, not famous, but good at what I've done.
And if my mix produced me, then it musta been OK. Versus the view that unless you've got famous ancestors, and a prestigious family, a dignified name, you can't be worth very much, and can't be expected to amount to anything. I reverse that. I made myself a success. Giving my ancestors some grateful retroactive credit for the genes I inherited.
I know, some convoluted thinking. But I won't be constrained by traditional concepts of personal worth and social standing.
My Mother always said the smartest and sturdiest dogs were mixed breeds. The weakest and shortest lived, she claimed, prone to all kinds of problems, were the pure-breds. Choose a mutt, she told me. And that's what I am.