As you step up to speak, does your heartbeat race, breath become shallow, muscles tense up? If so, the good news is you are normal. While we all would prefer this not to happen, the truth is, public speaking activates your adrenal glands creating nervous energy.
Make a conscious decision to use purposeful movements, meaningful gestures, as well as direct and continuous eye contact. Harness that energy and make it work FOR you NOT against you.