I can't control my voice infront of a crowd. What should I do?

I can sing good when I am alone. or:I can sing good when I am alone.or:the reason why you cant control your voice in front of the crowd is because you

I can sing good when I am alone.

or:I can sing good when I am alone.

or:the reason why you cant control your voice in front of the crowd is because you are nervous so get that nervous out or close your think that there no other else than you and feel the song your singing from your heart

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