challenging in public speaking...

In public speaking, we have six task will be done. The first one is informative speech, second is forum, third is persuasive speech, fourth is impromptu speech, then blog writing and the last one is group discussion. When talk about challenging in public speaking, my heartbeat accelerated. In my class, there have many challenger. They are very good when speak in english. I felt scared when they start their presentation. They are very good and excited with material that will be presented. I felt scared because they are very committed with their work. I felt so small and shy with my work. My pronouns also is too bad, but everything was okey when i confident with myself and do not think what people want to say about me. I just do my work and pray, what i want to do is clear and will be make my lecturer satisfied with my work and presentation.