Are mixed-race people less happy?

People who are racially mixed often say they feel like they are in a racial "no man's land," neither one race nor the other. Are they less happy than people of only one race? Let's look at Black-Whites first (2021 GSS data): 

Mean happiness for White-Blacks (2.02) is slightly higher than the mean for Whites (1.96) or Blacks (1.90). Those who say their "race" is both Hispanic and White are less happy (1.78) than Whites (1.97) or Hispanics (2.08).

The same pattern is found for those who say they are both White and Native American: a mean of 1.82 versus 1.97 for Whites and 1.91 for Natives.

Finally, I merged Chinese, Japanese, and Koreans together and found that the White-NE Asian group tended to be less happy (1.78) than either Whites (1.97) or NE Asians (2.01). 

So with the exception of Black-Whites, people of mixed race tend to be a little less happy than those of one race. There is some support here for the contention that having a mixed identity is not conducive to happiness.