>>104989In all honesty it was probably just them not paying attention to you at all and giggling like ADHD middle schoolers passing notes with fart jokes on them while the teacher is instructing a lesson. Even true if they made awkward eye contact with you during your presentation.
When I was in speech 101 class in college I thought of something hilarious my friend had said a week before while a girl was just beginning her her informative speech presentation. I could barely breath as I was struggling to hold in my giggles. She kept looking at me because of it. Worst is that I only did it during her speech, she was the only black girl in the class, and she did her speech on weaving hair extensions. I'll never forget her "if you can't achieve it, weave it. if you can't grow it, sew it" slogan at the end of her speech because that's when I finally calmed down.
So yeah, most likely not you, something between them that just didn't make you feel good as you were struggling with stage fright,