If you still suffer from stage fright, ask your doctor to prescribe propranolol 10 mg 30-60 minutes before performing. It's a time dose of a beta blocker blood pressure drug that stops the sweaty palms and racing heart. Most people only need to use it a few times to get over it.
As for your onstage persona - play with it at home. Remember the audience WANZtS to like you and don't really hears all the mistakes we hear. I'm not great at this either because I'm so seriously focused but the better rehearsed I am the easier it is for me to notice the audience.
