Actually, Leggy, if you're looking for a serious answer, here's mine:
I'm one of life's natural 'loners'. (Perhaps that's because I was an only child). I enjoy things like day trips and holidays just as much (or probably more) on my own as I do in the company of someone else. So, perhaps unsurprisingly, I hardly ever feel 'lonely'.
A rare exception might be when I venture into a pub. I can drink more cheaply at home, so if I go to a pub I'm probably hoping for a 'good natter' as much as I am for a good pint. The last time I can remember feeling rather lonely was in an absolutely packed pub, in the mid-evening, when everyone else was in couples or groups, and there was nobody to talk to. In fact I can't ever remember feeing lonely when I've been completely on my own; it's only when I've been alone in a crowd (irrespective of the time of day) that there's a hint of loneliness.
(Bloody 'ell. That's all a bit serious for this time of night!)