What I meant by fooling is relating to perception. In some cases, perception is everything. What starts out as an act becomes genuine.
Pretend you're a shy person that hates public speaking. However presentation skills are virtually a must-have if you want that senior management position. What do you do? You pretend you're okay with everything. Step in front of the investors and make your speech.
Yes, it's an act. But your audience is expecting you to sell stuff to them. Because of their expectations, they didn't see it as "fake" because it goes with the position.
A positive response (or at least not a negative one). You see that perhaps your initial fear is an overreaction. You go out there and make some more speeches. Practice makes perfect.
It doesn't really change your base nature as an introvert... so what's wrong with "faking"?