Social anxiety. Meeting SO extended family. Uncle has never met a black person

*wasnt sure what section to post this*So in 2hrs I'm going to meet hubbys  extended (aunt and uncle) family they're visiting for vacation. I have moderate social anxiety disorder, so obviously not good with social skills. To make matters worse where they come from is 0.2% black people. I've never met someone who hasn't met a black person or seen one in person. (Im in an interracial relationship if you haven't caught on) I don't think they're racists. I know I'll  be extremely uncomfortable and it will show. What do I talk about??? 😩😑How can I calm my nerves (I don't drink alcohol). I just feel like they will look at me strange the whole time. In all honestly if I met a white person for the first time I couldn't help but to stare because it's something you've never saw before in person. Ugh we'll be there for 3hrs max. I need to relax, breath. Social anxiety is horrible. My hubby said its ok if I stayed home but that would seem odd and I don't want to disappoint him so I'm going to push myself.