Hi
This might sound silly but something that really helped me when doing presentations in class was that i knew everyone around me is also nervous so instead of paying attention to what i was saying, most people were just having their own thoughts and nerves about presenting next. That helped me narrow down my audience to just my teacher and a few other students and i pretended like the other students werent in the room with me.
Also drink lots of water, breathe slowly, make sure to present it in front of ur friends or a family so you know exactly what to say.
wear clothes that u feel good and comfortable in. wearing something we like helps our brain calm down and we feel mentally better when we look better.
Dont worry about what other people think cause at the end of the day everyone has their weaknesses and no one should be judged for it, lifes too short to spend ur time worrying.
i hope ur presentation goes well and even if it doesnt, its not the end of the world u still have time to build up ur confidence.