It's bugging me to read this sentence so I propose a rewrite:

I don't know about you, but for me personally, it has always had the ring of a challenge. I like to think that I have a potent imagination, and non-negligible experience in the affairs of humans. Therefore, I am certainly able to imagine how you feel, am I not?

::

For me, that phrase has the ring of a challenge. I have a potent imagination, and non-negligible experience in the affairs of humans. I am certainly able to imagine how you feel, am I not?

(after looking at how I wanted to edit this sentence it would appear that I wanted to remove some/all of the hedge and crutch statements from the point of the sentence)

I would also add:

You might have heard this or similar from someone

and later

also with a less literal interpretation of her statement.

You appear to have switched genders on your imaginary friend. I would suggest you pick non-gender for the whole piece.

Other than that, neat little concept. (Even if I do agree with Gram's alternate explanation of the event - I think you might both be right)