Drama Performance GCSE

So, it’s my GCSE drama component one performance (the devising part) and I’m quite scared. I don’t really have a major role, I’m a narrator and I have a duologue at the end. I don’t know if I’ll be able to showcase myself as an actor, to get all the marks. The other class is watching us as well and I’m proper scared. I’m just nervous it won’t go well and I won’t get good marks. I know the performance is only 15 marks and that portfolio is 45 but I really really want to do well. Also, everyone else in my group has big roles but I don’t so I’m really depending on my duologue at the end to show my skills. I’m supposed to be quite angry but how do I really show this, especially since I’m being watched?