Oh you’re not the only one. Back in my presentation days in college I used to experience the same thing, or perhaps even worse. I’ve studied all time about my subject, read online and watch video about how to do a good presentation and such. And guess what? As soon as I appear in front of everybody my mind suddenly becomes blank. All those things I’ve memorized and keep telling myself to do it right suddenly vanish. I ended up explain things spontaneously and luckilly all those memories gradually return as I keep explaining in my own way and I ended finishing the presentation in my own personal way. It’s the same destination with slightly different route. All those time and I have finally found the secret. Stop thinking too much that what you can do to make it perfect. Stop thinking that you’ll make a mess. And finally, stop trying to impress your audience. Simply imagine that the room is empty and you’re in your own bedroom. If that is too hard, then just think (yes, you must think this way) that your audience are a bunch of stupid people and you have to brighten their mind. With this kind of mindset and superiority behavior I find that it’s the same like telling little kids some information they don’t know yet. Think that they will just waste your time but you will still explain anyway.