I don't have any confidence in my English speaking. Can you give me any suggestions?

It's okay if you are not confident about your English. Write the whole thing that you are going to present and refer it to your friends who are good at English and ask them to correct the mistakes. After doing this, practice the whole presentation for several times until you get confident. Just make sure that you are not reading the whole thing as it is set forth in the paper. Use your own words in between the presentation to ensure the clarity of your presentation. Finally, the only way to get confidence in English speaking is to practice a lot. If you are scared about something, then try to do it again and again, so as to reduce your fear. And don't forget that it's okay to be a litter nervous, it helps you to do it properly.