People often feel nervous in many situations, not because there is something wrong with you, but because you care too much about the outcome and want approval too badly.

You're nervous when talking to a beautiful girl because you care about her opinion;
you're nervous when reporting to your boss because you're worried about affecting your future;
you're anxious during interviews or public speaking because you want to perform perfectly.
But if you look at it from a different perspective, many results are not entirely up to you, and others are not as important as you imagine,
your pressure will decrease.
What truly helps people stay calm are three things:
First, not obsessing over the outcome or relying too much on others' evaluations;
Second, building confidence and ability through repeated practice.
By achieving “not overly expecting results and being genuinely prepared,”
nervousness will naturally lessen, and your speech will become more composed.