Col you have to BE THE MAN when your singing on stage ....
your in control...what you relate to the audience with stage presence has to let the audience know that YOU yourself believe what your singing then it will translate to the crowd and they will believe what your singing, I can only suggest to you to watch alot of PRO Singers on You tube and take note of their body language, and most of all Build up YOUR CONFIDENCE to a point of cockyness as if your the Best freaking singer on earth!! Because if you don't look them straight in the eyes & believe what your doing on stage NO ONE WILL! And memorize as many lyrics as you can !