Ultimately, public speaking is all about serving your audience. Whoever they may be, you are there to offer them value. They aren't looking for perfection, and they don't care about how well you "perform". They only care about your message and the value you can offer them through it. Nothing else. In fact, if you do make a few errors or mess up a bit, it will make you even more relatable. On top of that, if you own those errors, you'll come across even more authentic. This only builds the connection further. After all, your audience is human beings just like you with the same fears and doubts. Something important to keep in mind is that you are not speaking IN public, you are speaking WITH the public. You are sharing value and service with them.