Many people are nervous giving speeches even when they know the language perfectly. I'm sure that if the class knows that English is not your native language, they will make allowances for that. After all, why should you be able to speak perfect English?
If it's any consolation to you, I'm sure that many people in this group have the same fears of speaking English in public. But the more you do it, the easier it will get.
Student or Learner