Here’s something that worked well for me with my anxiety at social interaction.
I tried seeing every occasion where i had to do something that i was rubbish at (for example asking girls out, or speaking in oublic at) as a practice run. I wasn’t really personally invested in it, i was just learning how to do it better, practicing for the day i was really going to need it.
This really helped me take the edge of the nervousness, and thus i relaxed. Being relaxed, everything went better, and i started gaining confidence. After a while i could do it without feeling anxious at all.
Think about it, if, for example you are playing a game online, are you worried about failure? No. You are just practicing to be better the next run, to have fun and get better at it. There is nothing invested, and nobody will die if you do poorly. This is how life works as well.
Try thinking about everything you are anxious about as a practice run for the next time, I think is the best advice i’ve ever gotten for overcoming performance anxiety. After a while you will find you can treat everything in life as practice, and you will become more relaxed.
In nerd terms: treat it like an RPG, you are just gaining experience points so you can level up :)