Fake it 'til you make it. Act confident and eventually it will come.
I used to have a home business years ago (you know like the Tupperware parties) where I had to do presentations and demonstrations. One thing I noticed at oher parties is that newbies would stand up there and wring their hands and tell everyone to excuse them, this was their first time, they were so nervous... Not good. Now everyone else was sensitive to every little blunder the presenter made. So when I started, I decided not to say a word. I just did my thing like I had been doing it for years and I began to relax and have a good time and no one knew I was inexperienced. I acted confident, they thought I had my act together and eventually, I did.
Also, remember, we ladies are just people. We like to know that guys notice us and pay attention. Like Jay said, practice "noticing" and commenting in a friendly way.
You got this.