How can I stop getting so nervous while doing a presentation?

I haven't ever finished a whole presentation whilst my time at college, and if I do I get so nervous and scared and run out. I cry as well because all the effort I put in to making it has gone to waste, but when I make it I think I'm really gonna be okay - i got my notes, the pictures - i've helped myself so that i don't stutter or become speechless...but it doesn't work.

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