How can I overcome this problem?

I really like this girl in my class and i have one more day to talk to her until she leaves the school. I know i won't be able to become friends with her in one day so i just want to be able to talk to her at least once.
But when i get the chance to talk to her i get to nervous and shy so i chicken out. Im afraid i might chicken out again even though this is my last chance to talk to her. How can i not chicken out and actually talk to her?
How can I overcome this problem?
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