I'll caveat this by saying I am autistic but I wondered of anyone else - ND or NT experiences this. I don't think it's an 'autistic thing' but I also don't know anyone else who feels like this.
I don't really know how to explain this so I'll give examples.
When I was a child, I went to a birthday party at a theme park. I didn't go on any of the rides but opted to stand with the adults and hold coats and watched everyone else on the rides. I had no desire to go on myself - I just enjoyed watching my friends having fun, smiling and enjoying themselves.
Now, as an adult, I'm not really much different. I like to go to places and do things but my enjoyment is derived mainly from watching other people have fun rather than experiencing it myself.
I'm asking because my partner and I have been invited to a NYE party. It's fancy dress. I like the idea of fancy dress. It's just fun and people enjoy it. But I have no desire to take part. It makes me feel really uncomfortable.
I went to a gig last night. I must have been the only person in the room not dancing. I find the crowd a bit overwhelming and the way I deal with that best is to just shut of into own world. But it means I don't move at all. I realised when my back was aching that I'd not shifted at all for about an hour. And then I went an sat outside where I could still hear the music but wasn't part of the crowd. I love seeing and hearing other people enjoying themselves but have no desire to get into the middle of it in any way.
My garden backs onto a train station. Sometimes I lie in bed listening to the sound of people laughing, talking and singing as they get off the train after night out. Again, it doesn't even bother me if it wakes me up. I love hearing the sound of people enjoying themselves without needing to be part of it or experience it first hand.
My partner knows amd understands this but I do worry it must be a bit boring for him especially when I can see other people having fun with their partners and I get more enjoyment from watching other people participating than doing so myself.