Hey OP, here's a couple things you should know about therapy no one really talks about.
1. Therapist are humans and naturally, there are human's you're not going to get along with. When people talk about common ground, they mostly mean people you could get along within a reasonable, professional manner. My friend went through three or four therapists until they found one who was into fanfiction, and they ended up talking a lot about fanfiction in general in their sessions.
2. It's okay to not like or get along with a therapist, see 1. above. And its also more than fine to stop seeing a therapist because you don't like them or because they're an ass to you. Just because someone has that magic title doesn't instantly mean they know what they're talking about. There are way more bad therapist in the world than good ones.
3. They're not doctors, and Faustek has a good point that if you're looking for someone to change your worldview and make you suddenly okay with the state of the world and your place in it in regards to your race, then they can't and won't. On the other hand, if the state of the world is giving you near constant anxiety bleeding into parts of your life where it shouldn't, like family, or even just the moments when you're alone, then that's what therapy is good for. Which leads into...
4. Psychotherapy can't cure your anxiety or depression (nothing in the field of psychology can cure anything) but what it can do is help you manage it. Sorry to say, managing is the best you can ever hope for, but still, you'd be amazed at the how much better the world can be when you're only half as anxious or depressed. It's good to keep your expectations in check.
Anyway, best of luck and my advice on the common ground thing is to check the demographic area around their office. If its some old white woman working out of her home in the suburbs, maybe not the best place. Look for stuff in the city in the less white neighborhoods. Feel free to ask them questions and mention a lot of your problems stem from race and try to gauge their reactions. If they stub their nose or something, fuck'em. If they nod, maybe. If they seem genuinely understanding then they might be good. But again, they could secretly be an ass because see #1