Your voice is an instrument to be played.
Emotional preparation is crucial.
So many people are afraid to face their fear of speaking to others. The fear of fear all too easily swamps them out as they start to talk. How they deal with this drop-dead gut wrenching fear varies from trying to keep control of their emotions by hiding behind a mask or by asking the listener to forgive them for not being very good. Neither approach ever allows them to speak with any conviction or passion. We all have to learn, but in no other area of life do we assume we can just do it, without properly preparing ourselves.