[Everglow.]

I relate so much to what you've said here. I think for some people (myself included) it's a matter of having a low social threshold. I get burnt out really easily if I'm around too many people. I have 2 people who don't make me feel sad and burnt out, but just about everyone else drains me.
For me, I'm always really honest about it, but I do have a tendency to make it a bit of a joke so that it doesn't come across as if I don't want to see people. I usually tell people up front that I like being home at a reasonable time to chill out with a cup of tea and that too much "peopling" drives me mad.

Honestly, I don't think it's abnormal. I think it's just about knowing your limits and boundaries and figuring out how to know when you're getting to a point where you feel like you'd rather leave. Perhaps you can arrange meet ups in a place you feel comfortable, which is within mutual travel distance (e.g. not at your house and not at their house, to avoid it going on too long), and let them know you're free for X amount of time and then you'll have to dash off? Also, don't feel like you have to have them stay over or you have to stay over. I used to feel exactly the same way when I stayed at friends houses. I'd never sleep, I'd overthink, and I'd end up feeling really unhappy, so I started saying I'd rather see people during the day and then go home at the end as it was more comfortable for me. Most people get it to an extent, and I am sure the people you hang out with would too.