The difficulty of having presentation in English

Academic presentation requires directness, simpleness, persuasiveness. And it is very difficult for English learners to have sophisticated and well-prepared presentation. Academic presentation is mostly consists of 4 parts, introduction , methodology, findings, and implication. Introduction part has to show what your topic is about and tell the whole picture and has to attract attention. Methodology part should be not long, it just tell how you had research. Finding part is the body of the presentation, based on your research, tell what you found. Implication part finish your presentation making your findings meaningful to the world. It has to tell "So what?" things. Relate your findings to the real world.
Actually, I had 2 academic presentations, last year. The first one was held in front of my classmate, and the second one was held in front of more than 50 people including some professors both native and non-native English speakers. The first one was painful, because it was my first ever academic presentation in front of people fluent in English, while mine was poor. I got really nervous before the presentation. But I noticed that once I started, that had gone. Because I well prepared, prepared what to say, I just went through the way I made. No contingency occurred that I seemed well done. But this easy thinking will be challenged in the next presentation. Well, the first one was I think good start for me. The second presentation, I of course prepared well, but not prepared well for my script and power point, not like the first presentation, because I had so much things to do of Computer Science. But I felt easy because I had an experience of presentation, and I felt I had a progress of English, that I thought I can handle that. And on that day, the professor said, a lot of people come including critical and professional teachers. I got really nervous because of my not very well prepared presentation. I realized that I have to manage it somehow. Once I started, I remember the feeling that was awkward, it was like I am speaking but I am not thinking, my brain was stopped. I read the script, and I don't think my explanation went as I hoped. And finally, I had a questions from audience. And at that time, my English was challenged, since I was so nervous, brain not working properly, I COULDN'T ANSWER.... Presentation is not like completely what you prepare beforehand, it is something that your whole English ability is challenged. I felt my English is not good, that I decided to do more harder. After the presentation, I got cold, really bad cold. That showcase that how touch the presentation was for me, but I think it is not like that anymore. Because I had those last year, those are my strength, source of courage, my start. I am now in the different stage. I won't stop, let's move on. Stay hungry, Stay foolish.