I agree about society's attitude to single people, which to some extent one even finds here . . . . . . occasionally. The rest is like planting seeds. It takes a while for things to take root. Honestly, I know I keep saying this, but what you posted I experienced at that time point.
It takes a long time to get the networks established, the friendship groups, and not getting sucked into things that you don't want. At the same time you are getting more resilient, and what seems to happen is that your friendship group expands while need to for alone increases.
I felt lonely, isolated, jealous of what i sometimes thought xh and ow had [even though I knew they didn't really]. What you feel is normal. What many people do is date, whether or not they are ready. There is a world of difference between being receptive to the idea and it happening, and I do think for most people they need time alone, hard as it is. It gets better.