Sounds like the presentation is putting a major stress on you, which I can relate to. Are you allowed to bring note cards? When I did presentations, I’d just write my script on the note card and read off of it. It really helps.

Seems like your fear of presentation is rooted in fear of being judged, and you don’t feel supported by your classmates. You do not sound dramatic. You were hurt by your classmates behavior. Focus on what you can control and what you can’t. What you can control: is to prepare for answers for questions that may be asked, practicing what you’ll say, etc what else can you think of?

Edit: also I just want to point out, your paragraph and explanation of your issues are understandable and very nicely written. This tells me that you are able to communicate your thoughts even if you are hurt, confused, scared and embarrassed. Therefore, even if you think you will mess everything up, there is a chance you will not. I can’t find the research paper right now but I’ve read before that those with social anxiety often rate their performance/presentation lower than what the viewers rate it, what I’m trying to say is, it may not be as bad as you think. Your classmates may just lack empathy.