I’ve recently started going to a kickboxing class

Mainly to improve my fitness, but I want to build confidence as well. It’s an all grades class so it includes beginners like me up to black belts. There’s two girls in there who’ve taken a super weird dislike to me and I’m not sure why. I’ve always been super polite to them but they just glare at me and look down their noses at me. I don’t think they know me from school or anything but maybe they were a couple of years below me. It’s really offputting and makes me want to stop going, but I suppose I need to ignore them.