I don't give two shits about my, yours, or anyone's ethnicity, and neither should you. I was also lucky to have my genes clash together in such a way that it's completely impossible for others to successfully guess what my own ethnic makeup is, so at best, people can only make assumptions about me based on what they think it is, and I and my sibling also grew up as the black sheep of the family because of our mother seeing what the grass was like on the other side, and we never once were treated in such a way that our skin color was ever something we were made to think about. I've been truly fortunate to grow up where ethnicity and race where never forced on me as part of who I am or a way I was obligated to think, act, or indeed, pursue relationships based on.
I've actually been in a relationship of three years with someone whose racial makeup is quite different from mine - something I didn't even realize until your own focus on sanctioned racism gave me pause, by the way - and it's been a total non-factor except to make racist comments at one another for our mutual amusement. I never feel anything is off or doesn't fit with them, and the only issue I do have is that their family is, as is that ethnicity's wont, extremely gregarious and family-oriented, while I personally am much more solitary and dislike large groups of people, and the noise they tend to produce. Amusingly, though, even my better half has become more appreciative of a quiet, intimate setting after their time with me, and occasionally finds themselves irritated and exhausted by their family's bustle, and eager to come home to the stability and peace my lifestyle has introduced to their own.
Variety is the spice of life, they say, and I'd rather enjoy our differences - some in more measured doses than others, admittedly - than focus on petty and superficial things such as skin color and race.