Your headliner is the answer. Listen to yourself......but after you've played.Record yourself and play it back so you can critically listen to your interpretation of the piece.When you are playing you often only hear how you Think you are playing. Listening afterwards is a real Ear-opener (oh no, way too much pedal there! or Crap , I thought I was playing staccato but there is no continuity in the phrasing). Listening post-playing will help you hear where you need to make changes in your playing to get the effects you want. A teacher/coach should be able to help also.
You have to give yourself up to the music. If I catch myself drooling onstage, it's a good sign... I think.
LOL I have done that so many times!! It's so embarrassing. I think it can be allergies too. What about listening to yourself as you're playing the piano and at the same time trying to put yourself in the audiances place and listen to what they're hearing?Is that possible?