Wear a cup.(Karate practitioner here)
Just like the title says: whenever I spar with a higher belt, I get nicely nailed in the face or stomach or some other above-the-belt target as intended, but whenever I spar a lower belt, they aim roundhouse kicks at my abdomen but end up kicking my crotch because of inflexibility and poor aim. This is very painful and the fear of it happening basically allows them to dominate me. It has reached a point where I'm 10x more afraid to spar them than I am the higher belts in my class.
What is my best course of action here? I love fighting but I don't love getting kicked in the nuts.