I'm long term single and wild camp a lot on my own although I do have 2 dogs with me, and to be honest, I'm not sure if I would do it without the dogs.
I do get very anxious about things sometimes, but usually it's more about mechanical problems than about where I'm staying, usually because I'm totally skint and mechanical problems are really stressful because I know it's going to take £££ to sort them out. So I make sure I've got full breakdown cover (which I've never needed but it relieves my anxiety to know that I can get off the motorway and either back home or to a garage or to my destination safely).
On the odd occasion when I have been aware of noises outside during the night, I just double check that all my doors are locked, curtains drawn and stay put, knowing that I'm pretty safe inside a metal van. I always make sure that my mobile is charged or on charge when going to bed and that I know exactly where I am and could give the exact details to emergency services if necessary.
But I've honestly never had any problems. Having the dogs puts my mind at rest but there are some forum members who carry dog bowls and dog leads to leave outside the van to give the impression that there are dogs inside the van.
And if you read my blog post, The first year with the BWV, you'll see that although I've been alone, I've had some wonderful times in my van and perhaps being alone has made them more special. And you do get a huge sense of self-satisfaction and achievement from doing something out of the ordinary and coping with problems on your own.
There are, as said above, quite a few singleton women on the forum of a similar age and it's been good for some of us to meet up sometimes to chat about experiences, concerns, good ideas etc. And you'll get so much help and support and advice from people on here, that when you do eventually manage to meet up with some of them, it feels like meeting up with old friends.
My van and this forum have been life changing for me in many ways over the past 2 years, and I've done things that I hadn't done for 20 odd years and thought I'd never do again, and I've done new things, and learned new skills etc. I'd now rather lose my house than my van and couldn't bear the thought of losing the freedom that the van has given me.