Any public speaking involves delivering information to people who are, in one way or another, waiting to get some information. This is a key reason why you should pay careful attention as you prepare to make you speech and as you plan to meet your audience.
Some people are naturals at public speaking and getting to audiences, you may think of politicians or a good college professor you took some classes with, the fact of the matter is most people are not good at making speeches and the vast majority of people are terrified of delivering a speech. This should not discourage you in any way, since many experts have studied this and worked hard for you to deal with these problems in speech making.
If you are at a point that you are going to deliver a speech, you probably got to a stage in your life your thoughts are worth something to other people, this means that in principle, people want to get into your head and they appreciate your talent or skill in some particular field, the people that will listen to you have something to learn from you. But you are not thinking of these people, are you? You are thinking of the few people that probably know more than you and...