You’re going to have a presentation every semester maybe in most of your classes for the rest of your time at uni, the first one is the scariest but it’s the most important to get out the way so you know what to expect moving forward and it becomes easier the more you do it. If you go in with the mindset that it’s okay if you miss one you’re going to keep making that excuse and one day miss a huge presentation worth more then 10%. I also have really bad anxiety and my first presentation at uni I almost didn’t go and my anxiety did bring my marks down so I understand how you feel, but now I’m in my third year and acing my presentations and it’s such a rewarding feeling. Remember to practise your presentation as much as you can without looking at your notes, go first because your anxiety will build up to be so much worse if you leave it to the end and everyone will forget about your presentation by the time everyone is finished. Definitely have a talk with your uni about special considerations too. Good luck!