completely screwed up my presentation

completely screwed up my presentation Did a 10 minute presentation with a partner. Stuttered and blocked from start to finish. Stuttered to the point that my partner deliberately spoke on more powerpoint slides than what he’s supposed to, as i was such a liability. The presentation ended up to be 15 minutes long as I stuttered a lot. Received smirks from classmates once i spoke. Partner told me off after the presentation telling me to stop stuttering, imitating my repetitive sounds. When I told him that we were 5 minutes off the mark he retorted 'If it weren't for you we would have finished on time.' Not a very good day for me ;(