Not a musician myself, but I once went through hell because I had to give the best man's speech at a formal wedding. I found that once you start, it gets easier; that the worst moments are the last half-hour beforehand and the first half-minute of speaking. With luck, when you settle into a song you are familiar with, a feeling of confidence will kick in.
Also in a different line of work, a friend of mine has to give an annual speech about tax-law ammendments to a society of accountants. He told me that, for a week beforehand, he has various stomach problems which we need not go into here. The point being that beforehand can be difficult, both short and long term. I suggest you think of a treat for yourself for when you come out the other side of the experience.
PS: Your concert is a month away? Invite as many people as you can to listen to you in the weeks you have before your concert - even if you find yourself playing solo in front of your aunts!
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"Am I enjoying this moment? I know of it and perhaps that is enough." - Sybille Bedford, 1953
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