I feel fine one day before the important event, manage to encourage myself in order to do it, but then during the actual thing I have to do, if I make one single mistake I start to panic and I end up ruining it completely, especially if it is something truly important to me and if I have people to  please or impress. I completely shut down under pressure, no matter how well prepared I am. It’s like all of a sudden I just forget how to act and what I have to do. This has stopped me from enjoying and taking amazing opportunities in my life and  is exhausting me mentally and physically. How do I stop this? Or at least how do I make it affect me less? Please, any advice is greatly appreciated.