Telling an ESFP that she makes you anxious/nervous is basically telling them that you'll be an energy drain. Give it time... your anxiety will diminish.
And if it doesn't, then you should look elsewhere. Why? Because your energy source is introverted, and being in a relationship with an extrovert (esp an extreme extrovert like the ESFP) who makes you anxious will lterally drive you crazy.
A little sexual tension is one thing...anxiety is another.