ShiroKuro Lastly, I’ll repeat what to me is the most important point: when you feel nervous, the single best thing to do is just forgive yourself and focus on the music. Let go of the desire to “not be nervous” and accept that begin nervous is part of it.
I don't do public performances, but this is something that has helped me a lot with lessons. Over time, I've come to accept that I'm going to be nervous and not play as well as I did at home. Accepting my nervousness has not made me a better player at my lesson, but it has made lesson days a lot less mentally taxing.
One thing that always throws me at my lesson is how different the piano at my lesson sounds from my piano at home. I have at times stopped playing because I thought I was playing wrong notes. The sensation goes away quickly, but it is there every time I sit down at the piano and start playing. I usually have the opportunity for a couple of minute of warm-up and those couple of minutes are enough to get my ears adjusted. But I do have to adjust.
twocats Today I went to a super casual playing event at someone's home, and on the drive over I imagined myself walking up onto a big stage and I got pretty bad anxiety just from the imagery! And then when I played my piece (not a difficult one) I was so thrown off by the bright lights and the unfamiliar piano that I played a whole bunch of wrong notes. I don't think think it was nerves from the crowd, just being in a totally different setting.
If you tell yourself not to think about pink elephants, of course all you can do is think about pink elephants. So suggesting that you not think about walking onto a big stage is not very helpful. But perhaps you can work on substituting some other, less anxious imagery. Maybe envision your own piano room, or previous occasions when you've played in front of others. Imagine the piano sounding different, but playing through and getting satisfaction from playing for others. As I mentioned above, I don't perform in public, so take what I say with that in mind!