I was fully qualified for the job, but they gave it to a black girl.
You don't think she was qualified for the job as well?
I don't think that she fit in with the company culture.
Just because a black woman was given a job over you, it doesn't mean that she only got the job because of her race. You shouldn't assume that a black person isn't as qualified as you, that reinforces a harmful stereotype that Black people are only affirmative action hires. Instead of fixating on a black person getting the job you wanted, take a step back and evaluate how you can do better in your next interview.