I've had the same problem at university. Due to my course, a lot of speeches take place like debates, in which people have a time limit to make an argument and a counter argument etc. I knew I would find this very difficult, if not impossible. I got in touch with my lecturers and simply told them "look, I have a stutter. I don't think I will be able to do this". I offer to provide written work instead on the same topic or whatever. You're lecturers will no doubt have dealed with a range of students with many different problems. I am sure they will be undererstanding. All of mine have been. I have had hits and misses with speeches in uni. With my stammer I have good days and bad days. On some of the good days I have managed to get through speches despite stuttering a lot; other times I have had to quit a speech in the middle of it due to my stammer being so bad. The times I have done this have been some of the lowest of my life. I felt like shit for days afterwards. Coming to terms with your stutter is a thing that takes time and a lot of effort. Like any activity, if you don't feel up to it just now there is no shame in that. If it is something you want to get good at, the important thing is to start small and work your way up. Like any skill, it requires practice. Gradually de-sensitise yourself to the situation by starting small and working your way up. In time you may feel much more confident in giving a speech.