teakettle, I have been single for absolutley ever, my family and most of my friends live at a distance, I am the only single one. I'm now an adoptive mum and at that point where I live for scout camps so I get some peace and quiet.
No I'm not going to suggest you adopt, get a cat/dog/goldfish/hamster, or volunteer, join a church, parkrun etc etc
For me what worked was planning ahead, months at a time. I love theatre, gigs etc so I bought tickets for things I wanted to see, I took the iniative with friends, booked in things with them, weekend vists to those that don't live locally. A full calendar helps a lot. I very rarely had a weekend which was 'empty', even if I was doing stuff on my own. I put structure in to my weekends - gym, lunch out, shopping, garden, so I rarely woke up on Saturday thinking what am I going to do today.
I'm not saying its easy, I've had my share of lonely fed up weekends, untimately you have to come to terms with not having a partner, kids or whatever, or change it in some way - and only you can do that.