I don't think I'm unusual, I just can't decide whether my love for being alone stems from being an only child or if it wouldn't matter how many siblings I had as in a personality trait.
I have three siblings. My mother always reminds me of how I used to say.... 'I just want to be by my own self' I always enjoyed my own space. I think it's just a personality thing, tbh. I get stressed if I'm around too many people.