When you have a phobia you have two choices. You can either tolerate it, or you can say: Enough! I said: Enough.Now I love public speaking - it's an artform in its own right and a doorway to the future. Anyone else can learn the skills of public speaking too - you just have choose to do it, to face up to your fear and to keep working at it (this applies to overcoming any fear, by the way).
Here's the secret: If you don't learn how to control life, then life will control you.