Dale Carnegie said this quote

“ Students of public speaking continually ask, How can I overcomeself-consciousness and the fear that paralyzes me before anaudience?Did you ever notice in looking from a train window that somehorses feed near the track and never even pause to look up at thethundering cars, while just ahead at the next railroad crossing afarmer's wife will be nervously trying to quiet her scared horse asthe train goes by?How would you cure a horse that is afraid of cars—graze him in aback-woods lot where he would never see steam-engines orautomobiles, or drive or pasture him where he would frequently seethe machines?Apply horse-sense to ridding yourself of self-consciousness andfear: face an audience as frequently as you can, and you will soon stop shying. You can never attainfreedom from stage-fright by reading a treatise. A book may giveyou excellent suggestions on how best to conduct yourself in thewater, but sooner or later you must get wet, perhaps even strangleand be half scared to death. There are a great many wetlessbathing suits worn at the seashore, but no one ever learns to swimin them. To plunge is the only way. ”