Nervousness is common with all speakers, even the most experienced ones. Put that anxiety to work for you by channeling the extra energy into your delivery. You will be more animated and come across more forcefully. Your confidence builds as you notice the effect this has on your audience.
You may still notice a little nervousness creeping in from time to time. Much of that is self-induced, as we are naturally self-conscious. While in front of groups we are assessing our performance and wondering what the audience is thinking. We assume they are finding fault with every aspect of the presentation. This leads to self-doubt, which breeds nervousness.
Also, occasionally throughout your presentation you may experience a brief hiccup in your delivery. Perhaps you forget a line or the laptop fails to deliver the next slide. Those will cause some nervousness. Just plow on. You will soon be rolling along smoothly.
Keep in mind that not every audience member will offer you a friendly smile when you glance out. Many will be staring off in the distance or at the floor as if distracted. Some are. Others are actually focusing on your material. Concentrate on your presentation, and you will do well.