It is certainly understandable how some people feel a certain amount of fear or apprehension when approaching public speaking. I do believe that everyone feels some of this anxiety, but, like everything,I have found it to be something which gets better overtime.
The first experience I had with public speaking/speech making was when I ran for vice president of my school in fourth grade. This required a speech given to the student body and teachers. Overall, it was a positive first experience which I again repeated the following year when I ran for president. Since then, I have had a pretty substantial amount of experience on stage as an actor in various plays. Although performing is not really “public speaking” it still produced the same butterflies that precede public speaking. Additionally, as a jazz trumpet player, I would often take several solos during a performance which could be quite nerve wracking as well. This is also not public speaking, but I think the attention being placed so squarely on you is what makes something like public speaking or performance so scary.
One of the best things anyone has ever told me about speaking publicly is that the scariest part is the second before you go on. If you can get past that moment, all the rest is easy. This idea helps you get on the stage, and thinking about it while there helps to keep you going; knowing that the worst is already over makes everything else seem easier.