All you have to do is just flow with the character and imagine that there is no one around. If you can do that, the rest will come out beautifully, whether it was perfect or not.
I think I had stage fright before the performance, but I felt I was confident after it. I think I would not do good at all, but in the end, I do. Only your effort should be noticed.
If you tried your best, then everything is perfect.