I struggle with this too Venus and it was very bad when I was younger. The good news is, I learned to manage it although it doesn't go away completely. I didn't get professional help but imagine it would be easier to manage with help - wish I would have got help. The way I deal with authority figures is, to imagine they're just the same as everyone else and maybe they also have their own vulnerabilities. It got easier as I got older and wiser.

I was painfully shy when I was a child and find people with social anxiety are totally preoccupied with worrying what others think. The fact is, most people aren't focused on others. Try to replace the inner negative criticism and reassure yourself.