If I had an ethnic base to identify from, if I was even Irish American, that would have been something formed, if I was a working-class woman, that would have been something formed. But to be a Heinz 57 American, a white, class-confused American, land of the Kleenex type American, is so formless in and of itself. It only takes shape in relation to other people.
Here's a short film by Christopher J. Rock in which he asks white Americans what being "white" means to them. Like most white Americans, his interviewees find this a difficult task.
Rock has posted this film on YouTube, where he asks for comments because he's thinking of expanding it into a full-length film. If you have ideas or suggestions for him in that regard, you can go here.
One topic you might address in the comments here: Why do you suppose white people often find it so difficult, and even uncomfortable, to talk about their own racial membership?