So, I've felt this way for a long time (but being stuck in lockdown with my housemate has really confirmed this for me). I dislike being around the same person for long periods of time.
This is why I've always struggled with housemates in the past (they thought I was too anti-social for hiding in my room all the time), and this is why I've struggled in office jobs (I now work from home). The fact is, I get really claustrophobic and uncomfortable socialising with the same person for days/weeks on end.
Don't get me wrong, I love socialising when its on my own terms. I can happily go out to pubs/clubs on weekends and I enjoy seeing my boyfriend after a long week away from him. But I'm safe in the knowledge that at the end of the weekend, I can go back into my own space and have "me time". I'm not sure why I need more "me time" than the average person but it's just always been that way.
At the same time, I know that if I want to get on in the world, I need to compromise. My boyfriend wants a future with me and he wants us to buy a home together later in the year. This really worries me because I'm scared I'm going to grow annoyed with him and start to resent him for being around all the time. E.g. my current housemate is a really nice guy but he asks me to watch TV with him nearly every evening and it exhausts me (sometimes I make excuses but I hate seeming rude),
My boyfriend is a big old extrovert and I'm worried I'm going to upset him by always needing my own space and needing to take off on lone walks etc without him joining me.