Whiteness has no meaning outside the systemic construct of white supremacy. There is no separate 'white culture'. It's not an ethnicity. It's not a nationality.
Those of us born and raised as 'white' were formed to benefit from the systems of white supremacy. 'Whiteness' is inherently racist. That's it's sole purpose.
The question is whether you acknowledge that truth and then what you're willing to do about it.