It seems to me to worry about the performance - this is normal for any actor, singer, dancer. The excitement of the artist is necessary, it stimulates, it demonstrates that for you every minute spent on stage, priceless because you love your viewers, you love what you do, you will be ready to reveal the soul in front of the auditorium, but it is impossible to reveal without Unrest, otherwise sincerity will be lost.
The excitement is a significant component of any public speech, the main thing is that it does not interfere with you. This is just taught in the acting studios - how to overcome your fear when a hundred is sitting in the hall, or even more, the audience, and all the eyes are directed at you. And you have to show yourself, you need to sing, you have to play - the audience came to the performance not as to see how you are afraid, and then to enjoy the acting game, from the play, then the roles themselves.
I can share my secrets. First, you must clearly understand why you need it. What is your goal? I actress, I get a pleasure from it, without the theater scene I can not imagine my life - these are my goals, my main motivation. You can have completely different goals, but at the same time no less significant: for example, I want to take place in this business, I do a scientific report that should change my career. As soon as you decide on targets, you can move to less "significant" things, i.e. how to take yourself in hand before the performance. There are many ways, and each artist has its own: mantras, prayers, relaxing tea, massage, concentration.
Remember, mantras and relaxing tea never affect if you neglected rehearsals. Rehearsals, preparation for public speeches, whatever they were - this is the most basic, what should be in your priority. Everything must be verified, learned, rehearsed: how are you standing, where you are standing, how you have to move at what point you start dancing.
There is another little secret: walking on the stage in front of a great visual hall, choose one person for myself who you liked the most, and work, sing, tell your speech, prove the farm theorem only for him one, because to speak in front of one person Not so scary, as before the full hall. This is such a psychological technique that always works, they enjoy mastable teachers at lectures, and speakers, and artists.
In general, I believe that the most important thing in the fight with the "fear of the scene" is the love of what you do. If you can not live without creativity, then you have only one way - this is a scene, this is a viewer because without it you as an actor will not be able to take place. So, it is necessary to fight with your fears, and with experience fear of public speeches, of course, will, but not like at first. Therefore, you need to create, work on yourself and act through "I can not" if your career depends on it.