When you're nervous about reading in public, you tend to picture the audience as the enemy, distant and judgmental, just waiting for you to mess up. If you think about this for a moment, you'll realize that it's an illusion born of fear. In fact, your audience wants to love you and your work. Some of these people probably already do.
The audience is on your side. They love writing just as you do; that's why they're there. These wonderful people have taken time out of their lives, probably traveled some distance and spent some money, just to hear you read. They've come to witness your imagination at work. They've come to be moved, entertained, motivated, validated, informed, provoked, stimulated and inspired. In short, they're receptive.
They are your allies.