Having said that, I have been married for seven years to a person who is a perfect fit for me. I found him quite by accident, through work, and I wasn't looking at all. I was lucky, but I would be happy if I were single, as well. There are really great things about both situations, and there are really sucky things about both, too.
I think when you focus too much on what might be or what you don't have, you not only become depressed/angry/bitter about it, you just might push away the person you are looking for.
I have a sibling who always wanted to grow up and get married. And as soon as she was 18, that is exactly what she did. She is now on her fourth marriage, and is still not happy. She always wanted to be married, but marriage never makes her happy. The grass is always greener on the other side of her fence.
Relax. Buy the land. Live your life in a way that makes you happy right now. And I bet, in that process, you will be surprised by who you meet.
Thanks for the kind words. The "relax and let it happen" strategy has never worked well for me. Come to think of it, I've never had much luck with that strategy in any area of my life. However, I am focused on finding the best path forward under the assumption that I won't find a partner. The situation bothers me, but I wouldn't want to go the route that your sister has. I plan things pretty hard and pull back if the situation isn't right.