I describe myself to the escort, including that I'm Black, while discussing my expectations and whatnot. This allows the escort an opportunity to communicate whether or not we're a match prior to meeting. Please note - I don't apologize for my appearance or act like the escort is doing me a favor. Regardless of an escort's personal sexual preferences, they vary in their ability/willingness to connect with certain clients. There are, however, plenty of escorts (depending on where you live) that offer great experiences to a variety of clients.
On a related note, I know what it feels like to go into a gay space and feel like you're less than/unworthy/invisible because of your appearance. I've had to remind myself on severely occasions that my self-worth isn't contingent upon how others view me. I don't know if you've had similar experiences, but I hope you're able to have a good time with whomever you hire.