Don't be too hard on yourself man. Always try and find ways to improve for next time. The more time you spend trying not to stutter, the worse it gets. That's my experience anyway. I go in with a different mind set and try and challenge myself. Mid sentence I know that I'll have a block on a certain word so I always try and change some things around to make it work. Sometimes I succeed and sometimes I don't. I've gotten a lot better though. Don't give up man. You've just started uni. You'll do great. Change your mindset and I guarantee you it'll make a difference