At what point does a nervous guy give a creepy vibe?

Anonymous
I've had experiences in the past where I tried to muster up the courage to talk with a girl I liked, or come up with a witty conversation opener. But because I carried myself so nervously in her presence, I could sense some discomfort coming from her. And by the time I go for it, she already has zero interest in me. At best she just gives me a cold shoulder, at worst she's telling me to go away.

Every once in a while I still get extremely nervous. What kind of sub conscious mannerisms do nervous guys convey that make girls assume their creeps? I'd like to be sure to avoid that behavior.
At what point does a nervous guy give a creepy vibe?
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