Heya, I don't have much to offer other than to say I can relate almost entirely. I've been doing the same thing for about 6 years - almost housebound save the occasional post-midnight shopping trip and appointments and a handful of responsibilities as a caretaker. Isolated so far there isn't really even family left.

I've grown probably a good 80~90% content with only having myself for company in life but the rest of the time there is that occasional desperate loneliness... I'll seek out people in the area but knowing that I'll have to admit to and be judged for my issues at some point after contacting them (I have in the past a couple of times, it didn't end well because I require a lot of patience), I just kind of run away before anything ever begins. I tell myself I'll find a person/people to share with when I'm 'better', but better never really comes. Like you, I don't really care if it's romantic. Even a platonic partner for mutual support and to split the load (financial, acceptance, mutual support) would be more than welcome. But getting to that point is hard and it seems like online fantasy rarely pans out.

Anyway, not to highjack your thread. Just wanted you to know that as lonely as you are, there are people dealing with similar issues, hiding out in their own little safe space, having similar thoughts and feelings at similar times. Not sure it's any comfort, but I feel some relief seeing this. I posted something a bit of a vent like yours on another site once but I don't think they quite understood housebound/major introversion (which is fine, I don't blame them). I got suggestions like going to bars and making poker friends and couldn't help but feel even more small and isolated after reading them. The only thing I can say is hang in there and if nothing else, try not to take your own company for granted until you feel well enough to branch out - or until others branch out to you.