I came here to say the same thing. I have also been performing music since I was a child. I never really experienced any sort of anxiety about it because I ha

I came here to say the same thing. I have also been performing music since I was a child. I never really experienced any sort of anxiety about it because I have always associated the feeling with excitement. I accept the feeling will arrive, generally shortly before the performance, and that it usually helps push me to do better. If the performance is really short I find that I can feel a bit jittery afterwards since I don't get enough time to burn off the extra adrenaline. I can contrast this with rehearsals, where I typically feel no 'excitement' when working with familiar musicians. In this situation the music might feel a little flat, and sometimes I look forward to the actual performance where the adrenaline will help carry the weight.