Drama class infomercial creation

My personal barrier that keeps me from being a public speaker, is how clear I pronounce various words in the script. I have a tendency of mispronouncing words when it comes to actual presentations, although I could say it perfectly clearly during practices. This is due to how nervous I am. Although I could not find a remedy to completely stop my mispronunciations, there are some things I could try to decrease the possibilities of it occurring. Breathing in and out deeply and slowly, thinking positive about the outcomes, and try to focus on whatever I am about to do so I don’t go off track. From my own perspective, this barrier is a mental barrier. This is because my physical outcomes all depend on my mental state.