It's important to realise the audience is on your side. They aren't judging you. On the contrary, they're most likely in awe of admiration that even with your stutter you have the cajones to stand up and give a presentation, which everyone agrees is one of the most stressful things for everyone of all abilities. The audience are in your corner rooting for you through every block or repetition. Stutterers who give public presentations are superheroes. Own it.