Time might be the only help. That's my thought as my mom is the same. 'I read the preme babies have a tendency to not like touch when they get older"(meaning: it's not that you don't like anyone, it's that your hesitent. Which is wrong as I love to snuggle) If she doesn't get it with words a track record of not pursuing and showing no interest may be the only thing. Or another way of explaining it. I don't fully like how this sounds becuase I feel like I'm demening romantic relationships but it's the best way I've come to discribe aromantics and it speaks the romantic language: Romantics look for the one, their soul mate that will make them feel complete, whole. Aromantics don't pursue romantic relationships because we already have the other half of our soul. There is no need, want, or desire to look for what we already have. We are happy with who are and by ourselves.
Sometimes I wonder if romantics refusing to accept aromantics as we are is because of fear. The fear that we feel fine on our own. And the fear they they don't feel complete without a romantic relationship. That friends are the support we need and nothing more intense. I'm speaking purely as a asexual aromantic hermit mind you.