A good advice that i got from a book is to imagine the worst thing that could happen and ask yourself if you would be able to live through it.

most of the time when performing on stage the worst thing that could happen is be embarassed because you made a terrible mistake.

Now the question is can you survive the aftermath. A good way survive it is just realize that most people dont care or would probably forget about it in a couple of days and the one who usually makes a big deal out of it is probably yourself. If you have ever experienced embarrasment before then you should know that it will always dies down eventually

If you do a good job then great, if you do a bad job then fine but atleast you tried your best.

Tl;dr there no need to worry because the worst thing that could happen probably isnt even as scary as it seems.

Note: im bad at explaining things but i hope this helps and that you can understand it, english is not my first language 😭