I fully understand the position of those who have had long happy relationships and are now alone, but being alone, going home alone etc is not, of itself, a poor alternative to being in a couple.
As I said my daughter decided in her early 20s that she was too uncompromising to cope either with living with anyone or having children. Like most students she shared accommodation and that was enough for her.
She is not shy and retiring or a loner, anything but, and she has lots of friends that she can and does go out with, but she is just as happy, possibly more so, going places by herself and coming home to an empty house, with no-one to chat with.
I fully understand how she feels because I am similar and often consider how fortunate I was to marry someone whose work took them from home so much, that throughout my life there have been times when, sometimes for months, I have been living a solo life. It is not that my marriage is unhappy, it isn't, but my life has always been a compromise between my nature and my affections. In DD's case, she decided she couldn't make that compromise.
If people going places alone feel they are being looked at curiously or pityingly, then that feeling is in them, not other people. I have never noticed it, and I have travelled abroad alone for business and leisure as well as in the UK, and acording to DD, she hasn't either. I think it is a matter of confidence. DD and I are both very happy with our own company and will go where we want and do what we want to do, without looking for affirmation from others, or noticing whether they are looking at us.
As I said living alone, after a long happy relationship, is of course to have second best, but the person who lives alone and has chosen to do so, and there are many, is no more to be pitied than the happily married couple.
For heavens sake, you do not see men worrying about being on their own in any situation, why should women?