Loneliness is a worldwide issue for trans people. It is simply so much harder to find a partner, and often social opportunities are limited. It is even worse for us late in life transitioners. For many groups including teachers, nurses, and enforcement officers, finding someone who understands you can be difficult, and so they often partner with other people in the same vocation. Trans people are often the same.
I knew when my wife left me that I would probably be on my own for the rest of my life. I did have a man pursue me for my affections, but I am asexual, and I haven't gotten over the pain from losing my former partner, so I just couldn't be with him. I joined a seniors group, ironically formed to help reduce isolation in older people, and I am enjoying a number of social activities with them, and I am lucky enough to still have the love of my family, so I get to spend time with them.
But most days I spend alone, except for my online connections, and yes, I feel lonely. And in this, I know I am not alone.
Hugs,
Allie