Stop being nervous. The real deal here is to stay calm, and let things flow as YOU find as good. If you try to adjust to others, it simply won't work out. Make yourself feel comfortable, and see the results. :)
Also, if you can, try to stand in front of the mirror, and imagine the person in the mirror to be someone else. At that time, think that all you want to do is deliver your thought YOUR way. And why worry? If people find you boring, it's their fault that they can't appreciate a person's way of speaking. Believe me, people care in the least. And try to smile, always. Try to be serious but jokingly serious, that people don't feel alienated. A slight humor is always good. :) But, again, the main thing: SAY IT YOUR WAY, DON'T CARE ABOUT HOW IT IS DELIVERED. ALL YOU NEED TO MAKE SURE IS THAT WHAT YOU WANT TO SAY, IS SAID! Good luck!