I find it helps tremendously to tell myself firmly that nerves are selfish. Being too kind and understanding to onself can be counterproductive.

Also keep an eye on your breathing before you start. Relax your shoulders, and take a few deep breaths (right down, so that you feel the muscles of your lower back engaging).   Is this the technique you are already trying?

You may find it helps - some do, some don't - to look at audience members straight in the eye, so that you can engage personally.