<human>: We met a bit more than 2 years ago and we've been together for 18/19 months. I own a specialist bookstore and he kept coming in a few days a week and buying books. Eventually he asked me out, and we've been together ever since. It was a little weird in the beginning but we have the same interests and get along really well so that seemed to fade away pretty quickly. 

We're both very private people, but when he posts a picture of us on facebook, there's always comments, mostly from his high school friends, about our age difference. His brother has said things too. Stuff like "oh, couldn't find a girl your own age?" or stuff about me being a MILF. I know they're just joking, but this isn't just some fling, we're together. My friends always joke about it when he's not around.

I've never met anyone from his family before, but tomorrow I will be meeting them for the first time. It's his grandmother's birthday and there's a big get-together, so I'm literally meeting his whole family. I'm not a self-conscious person, I don't care what people think of me, but I care about him and I don't want to lose him, so I'm really nervous. I just hate the look on peoples face when he introduces me as his girlfriend. I'm a couple of inches taller than him too, so they seem to think that we have a kinky mother-son relationship. No, we're a normal couple. Why does it matter, anyway?

We talked about it in the beginning and he made it clear that he doesn't care. But I know that it bothers him when people point it out. It bothers us both. I try and ignore it, but it's literally all people want to talk about. I'm just looking for advice as to how to deal with it. Especially with his family.

Can you give me a shortened version of the text?
<bot>: I [F36] am in a relationship with a much younger guy [M21]. The comments people make are getting to me. Meeting his family tomorrow.