I pretty sure, but not absolutely certain.
Why do you ask? ^^;
EDIT: Whoa, how did I manage to become a Senior Member already?
EDIT EDIT: Now that I think about it, there was a time when I thought I was more of an INFP, but I don't think I use Introverted Sensing or Extraverted Thinking; I think I use more Introverted Thinking and Extraverted Sensing. How come? Well, I am always doubling back on what I say as it is coming out of my mouth, refining what I am saying until I feel like it is logically flawless, and that nobody around me can possibly misinterpret what I am trying to say.
Also, as much as I would love to be fine making sure I feel okay with what I'm doing or saying, I feel like that isn't always enough; I have to make sure that my actions are emotionally endorsed by those I love and care about, otherwise I feel like I am 'on the wrong track', so to speak. This seems more like Auxiliary Ti (since I believe I am prone to being lost in the throes of a Ni-Ti loop)
I am also very, VERY sensitive to details. I am very easily overwhelmed when I am presented with too much information at once, and I feel like I have Inferior Extraverted Sensing. I feel the least "like myself" whenever I am very stressed out, and I end up getting rather impulsive and hedonistic. I end up feeling like "F**k it, nobody cares about the bigger things, so I guess it shouldn't matter", and then I end up focusing on just wanting to please myself at that moment instead of trying to work on the 'bigger' things. But this is a cup that is very easily filled, so I end up getting dissatisfied with that mode of existence fairly quickly, and end up feeling like the bigger picture may be worth chasing after all.
An instance of my Fe in action when I was a child (like...5 years old?): When Princess Diana was tragically killed in that car crash trying to evade the paparazzi, my mother was very tearful and upset. I remembered that I had a "worry doll" upstairs that might help her feel better, so I gave it to her. I watched her carefully, but when I didn't see any PHYSICAL signs of her beginning to feel better (Se and Fe), I felt like I had "failed" to help her feel better.