Firstly, remind yourself that the worst that could happen really isn't that bad. It's not like you're going to accidentally wet yourself on stage, or start shouting random obscenities. Presentations aren't generally perfect so don't worry about being perfect: realise that the occasional mistake is no big deal. If you lose your place in your notes, it's no big deal. If you stumble over a sentence or forget to make a point, it's no big deal. There's actually not that much to worry about.
Secondly, you're presenting your work to the class and you know what it's about. Don't think of a presentation in terms of giving a speech, think of it in terms of explaining your views to your classmates. This is actually why I never write out a presentation in full - I make dot points and put myself in the mind of explaining those dot points rather than trying to recite something verbatim. (This does of course require being comfortable with the material you're presenting.)