OK, I think I know what you mean, but as the thread goes on you might bullet point the things you like and the things you can't, won't or don't engage with. I am similar in a lot of ways. I am a solitary individual, I've lived alone since I bought my first house at 28 and am now 68!
So while I like solitude, I do mix it up with other activities, but only those things that I know won't irritate or annoy me too much! Do any of these resonate with you OP?
I like looking out the window at the garden, the birds, the flowers, the changing sky, the trees, that kind of thing. I think I must meditate or something as I go into a bit of a "zone" while doing it!
Researching history on internet. I spend hours doing that. I am planning a little trip to Belgium soon to see Ghent and the battlefields around Ypres. Not many are as interested as I am, but my brother is, and he will come with me and we will have a great sibling "bonding" few days.
Reading, like you enjoy. Although I have to say these days I prefer someone to read it to me in audio format, and the narrator can make or break it! I enjoy history and biography, not so much fiction, although I have been known to read it!
Going off on my own for day trips or long walks. I don't need anyone to accompany me and sometimes when they do, they can irritate me as they don't seem to appreciate the beauty around them. I never say anything of course, as I enjoy their company!
There are lots of free concerts in my city over the Summer, just bring your sun hat and your water bottle and enjoy. Always great and lots of fellow feeling even if I'm on my own.
Pubs and late nights are long gone. Only for a wedding! Not missing much.
And so on.
I don't know if I've interpreted your posts correctly. But let me know.