I will lose if I be myself?

Shyness is the ultimate selfishness. Please, I don't say that to be cruel, but think about it. Why do you think they are thinking such things? Why do you ume they are thinking about you? More than likely, they aren't thinking about you at all. The focus is the subject, not you. Your contribution will affect your grade. Think about how much you've devoted to the subject and how prepared you are to discuss the topic. What you have to contribute is valid and worthy. Give it your best effort and be proud of it. Make your team proud of you. Stand up and show them how knowledgeable you are. Earn your grade with confidence and self-urance. Good luck!