No, gracesmum, it's not you! There's something about Bank holidays, as if we are all officially supposed to be having fun and if we're not, there's something wrong with us. I can resonate with your feeling that all the younger ones are having a great time, and probably not giving you a moment's thought. It's wonderful to think that they are well and happy, as you say, but that counting your blessings thing doesn't always work. So sorry that you feel tired and that life is not much fun, but feelings pass and change and hopefully you will wake up tomorrow in a happier frame of mind. In the meantime, why not treat yourself to one or two nice things, even if it's just a bar of chocolate or a slice of cake or an afternoon nap.
Hopefully, this will make you smile. My only social engagement today, if you can dignify it by calling it that, is to take a friend's cat to the cattery for her. Having said that, I do find it rather soothing to chat to the pussies incarcerated there, along the lines of - Don't worry, your Mummy is coming soon. Hope you feel better soon gracesmum.