Nervous/anxious about intimacy with girl I’m seeing

So I’ve started dating someone new around the a week after getting back on the mojo app a couple of weeks ago. Been doing something on here everyday but still can feel the negative thoughts/inner critic. I particularly felt it doing the self-Sensate exercise. Just feeling really worried. Don’t know if I can achieve results quickly enough that when we do get intimate/have sex for the first time, that I wont have any major issues and potentially ruin the changes of a girlfriend. Can anyone relate or any advice? Just really weighs on my mind at times