25 F, new to the bdsm scene

So I’ve recently met a dom and we’ve been getting to know each other and kinda slowly getting into the kinky stuff as we are both still relatively new. It’s been incredibly fun, but, as I have expected cumming has been difficult. Basically, I cum fine on my own, but if I’m around someone, my anxiety gets the best of me, and I just CANNOT cum. If I do it takes forever and it really irritates me. How do I get through this? Is there a way to trick my mind into being able to, or getting over it? We both love edging, and my dom gets off by getting me off, so this is kind of a huge part of it for both of us, but I’m feeling frustrated with myself over it. I had this problem in my last relationship and could never figure out how to get past it. It must be my anxiety, I can’t imagine what else it would be. Does anyone have any advice on how I could get over this? I really want to be able to do this when we are together.