Focus on people who are nodding.
When you feel like you aren't connecting with your attendees it can be extremely nerve wracking. And your nerves can be taken to a whole other level if there are people who appear completely disinterested. You can often look out in the audience and find a few people who are nodding along with your story or points. There is a real sense of reassurance when someone is agreeing with you. And the more you focus on these individuals, the more confident you sound. And the more confident you sound, the more people you attract. Part way through your talk, you could likely find a room full of people nodding along with you or sitting on the edge of their seats hanging on your every word. All of a sudden, the nerves are gone.