Identity and Authenticity

Less a post than a public note to myself: What are the possibilities of an approach to ethnic identity that proceeds from the following proposition?

Your ethnic identity is that with respect to which you feel inauthentic.

The roots of this idea are in Lacan’s symbolic castration, which registers the damage done to subjectivity by things like names. I worry that it might be too grounded in the experience of postmodern whiteness in America, but I think it has a bit more reach than that.