Is white lies allowed?

I am a student. And I have to give presentations and group work. I have done my group work but I feel to embarrass to or public fear of speaking not most of the time bc I want avoid it. And this is taken at Friday. Which will affect my prayer and some others work. So I told them I will do my part but just present it. Because I will be out of town. Is it sinful ? To avoid matter like this ? Because I’m not that strong about my presentation skill. I feel embarrassed.