Good evening Léa22,
Yes, I can see you’re shy, but you need to hold your own, and that’s why, even if you make mistakes, you have to use your creativity and try to stay in harmony, in rhythm… with the role you’ve been assigned. So, own it, prepare yourself. First of all, don’t start by saying “I can’t do it!!!” Why not? You can write, you can read, and you have time to prepare, so… no room for amateurism. To avoid feeling intimidated, look, but look far away, at the front of the person… the person, the audience will think you’re looking at them, but you’re not at all, hiihihiu, a glance to the left, to the right, to honor the audience…
You need to see what you're working on and in what medium, so you have to plan ahead.
Kind regards
Ladysally