What to do after screwing up with a presentation after being the top presenter ...and allt he class laphs ..and the teacher got disappointed by you ..I am by the way from the top presenter but today I wasnt ready and I was too tired ...but I screw up ..and I say out load that I screwed up ..
Deep breath. You're absolutely fine, everyone has their mess ups. When I was in the 7th grade I had a presentation to do and I had recently broken my ankle. I was so nervous that day and made So many mistakes I thought I was going to die from embarrassment. Mistakes tend to happen. It takes time to admit it, and learn from it, but all you can do is say you made a mistake. If you need to talk I'm here :)
It's grade school who cares. They're just laughing because it wasn't them. Watch some YouTube videos of professionals messing up on their speeches. It happens all the time. It doesn't mean your any less smart or awesome.