You will never eliminate fear before a performance and you shouldn't.
I have never really been frightened on stage. Actually I feel more frightened without the stage and especially if there is just one person listening and if this person knows a lot about music. I know you will think that's really weird, but it's true... So I'm weird.
Instead, talk to yourself beforehand and build up your confidence/passion/willpower/intensity until it outweighs the fear you feel.
Just concentrate, hear the beautiful music you will play... I you start playing after that, you won't even see the audience, it's just you and your music...