Fi is one of the functions in MBTI and Jung theory. You can read about it here, if you want. The more information you soak up, the better you'll understand your type and yourself, IMO.
Yes, I can see that you can be really gooey lol. That's not a bad thing, though. I think the world might need more people like us. Everyone here is so sensitive >_<
Well, keep working on yourself, if you feel good about the changes you are making. Are you very moody? What else do you have going on in your life?