Somewhere in the opening of your speech you need to let your audience know who you are; each speaker does this in a unique way. Your audience already knows something from your appearance and your introduction, but you need to let down your guard and reveal something personal about yourself. It can be in the form of an anecdote, a humorous story, and so on. But it should be something they can empathize with. President Kennedy once endeared himself to the French people when he made a speech in Paris after Mrs. Kennedy had made quite a splash there. He opened by saying, "I'm the gentleman who accompanied Mrs. Kennedy to Paris."
By putting your experience into the context of your talk, you personalize it; by sharing that experience with the members of your audience, you interest them in yourself, which will leave them that much more attuned to your words.