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It is natural to feel nervous before a speech, everyone does. Here are some tips that may help.
- Know what you are presenting, throw in humor, personal stories, and engage the audience to make it more interesting. If you feel the audience is enjoying it, you'll feel less nervous.
- Practice. Practice in front of the mirror, practice in front a group of friends, or even practice on a busy street ^_^, but practice practice practice. Be loud and confident.
- Relax. Don't just jump into the presentation, smile, take a deep breath, count to 3, etc..
Some other tips from personal experience that may help, instead of focusing on the people in the audience, I focus on objects behind the audience, haha I know it sounds weird... but it was easier for me talking to something that doesn't have eyes staring back at you. ^___^