I would still briefly introduce myself - it is IMHO simply disrespectful to an audience not to do that.
As for the very first minutes of presentation, I suggest starting with some fascinating and/or little-known facts (or mysteries) about your topic (i.e., "did you know squirrels can do (have) ..."). That should grab your audience's attention. Now, to keep it that way, you have to smoothly transition to your main content, unfolding the story line and painting a big picture by presenting material in a larger context. The flow of the story is one of the most important aspects of a good presentation. Easier said than done, but you should strive for it.
Another (additional) approach to keep your audience's attention is to periodically interact with people during presentation, time permitting. A dialog should be designed in such way that you initiate it at specific, appropriate places during your presentation. It doesn't mean that you should stop interaction, if it happens elsewhere, but you have to plan your breakpoints, nevertheless.
Finally, depending on a venue, audience and topic, an appropriate use of audio-visual tools might be a very good idea. For example, you can start your presentation by showing a slideshow with fascinating images or a brief video, illustrating problem and/or solutions that you will be presenting afterwards. Try to apply some creativity to your presentation and you won't have to worry about being boring and trying to catch your audience's attention. Hope this helps. Good luck!