I've only had stage fright for approx. 5 minutes, before I just enjoyed it. I usually play guitar on stage.
I still got/get very nervous the last minutes before going on stage, and fells like I have to pee the whole time.
But I have learned to use that nervousness to pump myself up the last minutes before going on, jumping up and down, and playing on my guitar while banging for myself.
As soon as I connect the cable, and have sound, the nervousness is totally gone, and I just look forwards to being on stage again.
As mentioned earlier, if I do make a mistake, I just laugh at it and continue. It happens that I look around to see if anyone noticed it, but I've gotten past the error already when I start looking at the audience, and get back to enjoying it. A wrong note(s) (IMO) doesn't take away from a whole performance live.
It's my favorite place to be.
Not sure if I've been of any help, but just rambled.
All the best.