Getting frustrated with coworkers

I’m having a small wedding with our immediate families and a couple of really close friends. After we started planning, I mentioned this to my coworkers that had been asking about the wedding.
I’ve been very clear and have explicitly said that unfortunately we’ve decided to keep it small and they won’t be able to attend. Still, there’s a couple of people that keep making comments like “I can’t wait for your wedding” and “at your wedding we can...”. I’m glad they’re excited for me, but the couple people bringing it up, I’ve never even hung out with outside of work and they don’t know my fiancée at all! This isn’t even my work friends being disappointed they aren’t coming, it’s coworkers I’m not close to at all basically wanting to “party” at my reception.
Ive tried being nice and patient but it’s really starting to bother me. I’m stressed enough planning this wedding in such a short time frame, I’m getting pretty frustrated with these comments. Am I overreacting, or is it really rude that they keep trying to invite themselves, even if it might be mostly joking around?

I really don’t know what else to do, I’ve told them all why I can’t invite them. My one actual friend at work is planning a kind of “bachelorette”/celebration for my coworkers, it will essentially be bar hopping with them. I’m hoping this will be enough to make them happy!