wasting my time worrying

I am a IT professional. I live with the exhausting fear of public speaking. I can deal with small meetings and other interaction fairly well, once I get to know the people. However, being the presenter and having all eyes on me is my GREATEST fear! I have no idea why.  I am the type of person who shines at work. Its a double edge sword! I tend to get huge raises and have lots of opportunities to move up. I have the fear that if I move up there is a MUCH greater probability of having to do presentations.

I spend most of my time worrying about something that does not even exist. Completely irrational thoughts! And I know it!