I dont really think that E or I test very well in general, me and my group of friends believe that it depends on how you recharge your "mental energy".
For an ENFP I tend to be pretty anti-social unless im around my friends, but every single test I take I score higher than 90% on my E. But if im not around people in general for prolonged periods of time I tend to become sluggish and depressed. The exact opposite is true for my friends ArbiterDewey and Metamorphosis. They lose in energy in that situation where as if there given time to isolate them selves for about a day every week their good to socialise for a long while.
Hopefully that helps, oh and WELCOME!