How can you not show your nervous when you see a girl naked for the first time?

Im going on dates with this girl and its going good. Except I'm a virgin and I have never seen a girl naked or done really anything.

How do I not seem nervous when I see her naked, I mean its just been so long. I have been waiting my whole life. I don't want open mouthed like I have never seen one before.
How can you not show your nervous when you see a girl naked for the first time?
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