The pain aspect is something you should address. First with your partner if their technique can be changed, and second with your doctor. And this one is like a layer cake - maybe you’re ace, maybe there is emotional context (that could be entirely unrelated to your current situation) that causes physical discomfort, or possibly there’s a physical component that your doctor might be able to help you with. Or some combination of all of them, because people are complex.

But romantic asexuality is definitely a thing, as is a number of variants within it.