Honestly, you cannot opt out of being perceived as "white" nor out of the fact that you have benefited from your "whiteness" but you absolutely can (& should) take whiteness out of your identity.
I consider myself white when I am perking up my ears to hear what racialized people have to say, but when it comes to the social club "White People", I am trying to make sure I'm not welcome. I do not claim membership, & I don't want its "special perks".