Hmmm. I wonder if I have lost my stagefright. No. Not really. But I can cope with it.
When I was your age, I hated doing solos. I play trumpet. I was first trumpet in the band. I had to do the solos. I think I pretty much always fucked it up. I’d make a mistake and it would stay in my head for the rest of the piece. Maybe longer. It would affect the rest of the night for me, and I’d get worse and worse.
We all make mistakes. In classical music, that can be deadly for the performer. For whatever reason, people expect perfection. Drama and public speaking are more forgiving. For one thing, people may not know you’ve made a mistake. If you just go on as if whatever you did was something you did on purpose, maybe no one will be the wiser.
I don’t do classical music any more. I only do improvisation. That way, if you make a mistake, you can unmake it, but acting as if it was deliberate. You do this by doing the same thing again. It works.
When speaking, I never read from a script. I was taught to speak to people, instead of to the podium. I learn my material, and then talk about it. Again, improvisation helps, because I can respond to questions without being thrown off track. Sure, sometimes I leave out stuff, but in the grand scheme of things, it really doesn’t matter.
Which leads me to the real skill to deal with stage fright. Mindfulness. You breathe, in and out, focusing on your breath while you focus on whatever else is in front of you. In doing this, your feelings about what you are doing can no longer get into your consciousness. There’s no room any more. You can focus on a couple of things at once—if one is verbal/mental and one is emotional/experiential—but not three.
A good way to practice this is to take a harmonica, put it in your mouth and breathe in and out through it. Long breaths. As long as you can make them. Then, try to have someone throw you by bringing up stuff that makes you anxious and angry while you are breathing through the harmonica. For most people, it’s hard to have the emotional reaction.
In Zen this is called detachment. You have feelings, but you treat them as just feelings. You don’t have to pay attention to them. You can pay attention to what you are doing, but not to unhelpful feelings about what you are doing. The breathing techniques—meditation, yoga and whatnot—are just different ways of developing the skill of detaching yourself from unhelpful emotions. Like stage fright.