Keep practicing your speech. In the mirror in front of friends. I use to bring school speeches to work to read in front of my co workers at a past job. Know your material. The people who will be there want to hear you. When I have to talk in front of people I think they are just there to listen. They are not judging me or thinking or hoping you are going to make a mistake. My brother asked me to become an ordained minister to marry him and his wife. It terrified me to make a mistake on such an important day. I got through it by joking with my brother right before the ceremony and I was so proud of myself after. And if you stumble over your words it is not the end of the world. Do your best and really just prepare. I believe in you. And like the post from kaliope xanex can help.