I presented my group's final year research paper as well. And also my internship project at State Bank which lasted for an hour. It's really nothing. I felt the same way when I was in your shoes. It feels like a mountain to climb when you think about it. But just rehearse the content well from your end and inform your audience of the stutter beforehand. It releases so much pressure in terms of the response your audience would give you when they hear you stutter, and lets you present in a more relaxed and proficient manner. Don't fuss too much about it and good luck. In the end, like any other event, this would also pass with time.