It is important to remember that "the audience perceives that you are less nervous than you may feel".
Speech anxiety or the technically known term Glossophobia is the dread of open talking in front of public. The word glossophobia gets from the Greek γλῶσσα glōssa, which means tongue, and φόβος phobos, which means fear. A few people have this particular fear, while others may likewise have more extensive social fear or social anxiety issue.