Hey there. My college also required public speaking for my degree, and it was certainly a horrible experience while it was going on, but it also was a valuable learning experience. Just rehearse, practice, practice, practice. If you can choose your speech topics, make one of your first speeches your experience with your stutter. I did that and I think it established very valuable class rapport and understanding. Talk with your professor on the first day of class and outline the situation to him or her; that really helped mine, and I believe my professor was more lenient with my grade. You really can't just avoid it all. I'm sorry to say, but there will be times in your life where you have to give presentations.