I think most of you have never had this problem but I do
That is without a doubt not true. I have never spoken to anybody (in school, or to some professionals) who has never had this, or a similar problem, including myself. So first of all DO NOT think that you are the only one who has this problem, it will shatter your confidence.
It does get better with experience, but in the mean time I have some other advice.
Set your mind to a "I can do this, they can't" state, simply because IT IS TRUE.
Take good deep breaths and focus on everything you are meant to do, slow the pace down if necessary.
Try and find a style of magic that suits your regular attitude and lifestyle, this will make you more comfortable and it will make your magic easier to perform.
Also, script your routines to fit your attitude and lifestyle, to again make you more comfortable.
Practice it all thoroughly before you go out and perform.
There is (I think) another thread on this somewhere, perhaps in the MINDSET section, so jump down to that other thread to get some other advice.
“Nothing can stop the man with the right mental attitude from achieving his goal; nothing on earth can help the man with the wrong mental attitude.”