I used to get stage fear, but I forced myself to perform a lot, but I find the most difficult to cope with instrument. Sometimes, I have to perform in a grand piano, different sound, touching and height of seat, it really makes huge difference when I play at home with own piano. I am so used to upright piano, come to grand piano, the touching, weight of the keys feel heavier than normal piano, it make me feel bit intimated.
memory leap is also set back, turning pages if I am reading the scores, distraction from noise. I mean how to cope with these sort external problems.