I've always had quite up and down self-esteem and think I also have some social anxiety, although it's never been diagnosed. I have 3 really close friends of 10 years + who I communicated with very openly and never worry what they think of me, but with other people, I'm always self-conscious about what I say and feel concerned that they are judging me.
This has got worse since lockdown restrictions have started to be lifted as I feel like I've just got nothing interesting to say. For example, I went to a close friend's the other day for wine in the garden and when I arrived it turned out she had also invited someone else who i only vaguely know. I spent the whole afternoon not saying much at all, even though if it had just been me and close friend I would have talked about a long walk I'd been on the day before or a good documentary that I'd recently watched on TV. I just felt none of my stories were good enough for the other person. Similarly, I went round a work colleague's house yesterday (we are still wfh) to drop off some documents and she asked what i'd been doing and I just said nothing much because again I felt like I had nothing interesting to say.
I realise that i'm probably about to get stuck in some kind of vicious circle because if I don't say much people will think i'm a bit dull and not invite me anywhere, and then i won't have anything to talk about because i haven't been anywhere etc etc.