Well the president of my speech club says to overcome the nervousness think of how your greatest achievement made you feel and if you could do that you can go up there and present

Also, rehearsing a speech/presentation too much makes it lose the passion. If you mess up it's ok no one knows but you.

Improvise throw some emotion in there

Oh ya be yourself up there too. Don't worry what they think of you or the presentation just give it your best.