Ina, it sounds like you are actually more looking for a friend than for a roommate. Finding a roommate doesn't mean you'll necessarily find a friend. Maybe you need to get out a bit and find some like minded souls to pal around with -- senior centers, church, volunteering are all great ways to find friends -- and you get to keep your private space private.
I totally agree with this, and think that if you had a good friend to do things with when you wanted to, then you would be fine. I remember you saying that when you were a little girl, your dream was to be an old-maid librarian, who had all the time in the world to read books and learn new things.
Now, you have your own place, and all the time you want to be alone and study.
But, even so, we all need a friend (even just a casual one) to spend time with and go places together.
I was an only child, and learned to spend a lot of time alone, entertain myself, and enjoy my own company. Even in school, I only had (or wanted) 1-2 friends that I did things together with.
Before I met my husband, I was living alone in a little trailer out in the country in Idaho. My daily company was my dogs. I had a friend that I spent time with .
She and I went to church together, in the summer we went kayaking, or other things we both enjoyed. Sometimes, we went out for a burger or just a cup of coffee together.
Pat lived alone, and so did I, and we both liked that; but very much enjoyed the time we spent together as well.
I really liked living alone. My time was my own. I ate what I wanted, when I wanted, did not bother anyone if I wanted to stay up late and play the organ and sing at the top of my lungs, even if it was midnight.
I walked with my dogs every day, and rode my horse when I wanted to. It was maybe the best time of my whole life.
However, some people are not happy just being alone, and you might be one of them, Ina. At least with a roommate, you are in control of the situation, and what the rules will be , and if it does not work out; then they have to leave. I think that the idea of volunteering somewhere that you can help people is a good one. There are a lot of seniors who are housebound, and would love to have a visitor come by and see them for a while once or twice a week. I think that you and Izzy would be perfect for that kind of thing.