I'm currently 28 and have lived my life alone. Never had any friends growing up, even in college. And when I finally did find a friend group (they were like family) a few years ago, we had a falling out and they kicked me out. I then had two more friends I was close with last year. But we also had a falling out. And now I have no one (besides my biological family).
Most days, I contemplate just not even bothering trying to make new friends and acquaintances. Not just because I'm afraid of losing them again, but also because I just don't want to put in the time and effort to do so. I just want to focus on acquiring as much money as I can so I can get an apartment of my own in the future.
Yes, I would be its only occupant. But I just don't trust myself to not screw things up with having people in my life again, be they friends or a partner. So I think it's in my and everyone else's best interest to just live out my days alone.