I understand how you feel. I dealt with this in college too. Fortunately, almost everyone hates public speaking. In my classes I had some students who didn’t have a stuttering problem stutter worse than me during their presentations! So if you have a bad presentation, don’t be worried or dejected. Everyone understands that presentations just suck. Colleges are usually pretty open minded and kind. You should email the professor and they might be understanding. Or I would go to the disability center and they might be able to work with your professor to accommodate you!