search, put in white in the ethnicity field and you'll get plenty of options.
You can fill in more fields to narrow it down.

...but to each their own.

Perhaps you need to do an advanced search where you can enter in the ethnic parameters that you seek. GL.

I think the majority of providers are Caucasian. Perhaps you're searching in a particular geographical location that has fewer Caucasian women than other areas.  

(By the way, I think there's absolutely nothing wrong with having a preference or preferences, even though yours that you mention here differs from mine. None of us should ever have problems from others about our likes and dislikes.)

We’re all mixed.

My Mother is Caucasian & my Father was Native-American, Spanish & Mexican. I identify with being mixed to perfection. I do not dismiss my heritage because I am Caucasian & Latina. I don’t think anyone is only 1 ethnicity theses days. DNA tests reveal that was a lie lol Smile 4 me!