So why do you give speeches? Is it just to hear yourself speak? 

Is it  because you understand the importance of public speaking? I suspect that  the answer to this question is “no”. We give speeches because we have  information that we want to share with an audience. Our goal for sharing  this information is to persuade and influence them in order to get them to take some sort of action that we want to have accomplished. In order to make that happen, your audience is going to have to understand your message, accept it, and then act upon it. What you need to do is to learn how to speak persuasively. 

It turns out that there are a number of things that you can do while you are speaking that will make this happen.