One of the senior centers here has a match up list of seniors, that they are always looking for people like you, willing to live in, in partial trade for helping elderly or disabled. Having 3 colleges nearby, most of the people who sign up are college students, which you would think would be a perfect match, but no. Lots of competing draws from college, and sometimes just lack of maturity makes them crummy roomates. Any chance there are senior centers or similar there that may have a program like that?
I wish I had decent advice on socializing(cuz I need it myself), but every year I realize I'm more curmudgeonly and antisocial than the last, and more content with that fact. Always fairly shy, I used to make a bit more effort at socializing, and found things that were interesting to me were easiest not only because the people you meet have the same interests, but also becuase your actually enjoying doing whatever (crochet, beading, drinking beer, whatever) so if the other people there are duds, you still enjoy what your doing, and if there is anyone your actually interested in talking to, the conversation will at least be genuine.
Never having been a person that goes to bars, or even drinks much, I've learned lately how easy it is to engage in conversation with literally anyone when we're all toasted. Ugh. I'd hate to think we all need to become alcoholics to have a decent social life.