You're paranoid. No really. When it happens the first time, it will make time go slow, your heart will race, you will feel like you're on fire, your pits will sweat, and you will have no idea what you're gonna say.
And afterwards, you'll think about that moment and cringe and mention it to someone who was there and they'll tell you they didn't think you were freaking out and in fact you handled it like a badass and everyone gained a newfound respect for you that day.
Seriously. Shame is powerful because of you, not because of them. You'll get through it. You'll end up more powerful, not less.