Thoughts, beliefs, and knowings shape your dreams. Thoughts, beliefs, and knowings shape your reality. Everything thing that was ever created was first a dream of what could be before it was conceived, including you

. Think of dreams as the previews before a feature film, and "reality" as the film itself. They are both images flashing on a giant screen at 24 frames per second, but we decide to call them different names, the same goes for dreaming and real life. It's when you pull yourself out of the box and look at something for what it is from a higher perspective, that it looses it's separateness. If you never contemplate, think about, or dream these "judging" entities, and pay zero attention to them do they ever enter your so-called reality??
The easiest concept for people to accept in creating our reality is that we subjectively choose (via free-will) alternate, objectively-based, (perceivably uncontrollable) realities. All of these objective realities are as real as real can be and do in fact exist, but theres more than one of them. Others can either judge you well on your speech, or harshly on your speech, both of those realities are there for the taking. But the only question is which interaction do you feel like experiencing? We all forget that we have that choice, or simply choose not to have it

. If somebody else consciously or unconsciously feels like having the experience of you giving a horrible speech, then they can have that. But you don't necessarily have to be there! If you want to put on the performance of a lifetime and be given a standing ovation, what you'll be experiencing is one of the infinite possible choices that outwardly crowd could have.
So if it troubles you to think that others are going to judge you regardless of how you feel about it, then the first step is to A) realize that it's troubling you, because thats your true self trying to reach out to you, and then B) change your thinking! You're simply choosing a possible option in your reality where you are limited to other people's choices and not your own. And there is nothing wrong with either, but if it's making you feel distressed enough to announce it publicly, that's your subconscious telling you something
On the other side of that coin, if you feel content with your new found discovery/choice in your reality, then congratulations you've got the hang of this and didn't even know it!