How you perceive any performance, what you say to yourself about that performance, trigger your emotional reactions. The only change would be in your self-perception or your interpretation of the performance. It could, in short, be the means to free yourself from fear and anxiety. Anxiety is Internal Some singers manage to perform well, stay confident and focused without too much anxiety. It is possible because anxiety is not an evil ogre waiting out there for you.
Anxiety is internal.
It does not exist outside your thoughts, outside your own head. Stress resulting from anxiety is not imposed by other people or by the situation. You might feel anxious about certain circumstances, but it isn't mandatory that you become anxious. It's not the situation that is anxious. Ultimately, anxiety is always under your own control.