I ofcourse know the general ISFJ charactheristics, but not what the "subscores" are saying about my personality. I got this:
Introverted: 78
You seem to have a strong preference for introversion. That would suggest that you enjoy a quiet and peaceful place over busy and active places. And this not only goes for places, but for people too. I might find it more meaningful to get to know your friends better, than gather up a large group of friends. Heck, you might even have a high criteria for what you'd call a friend of yours.
There's probably many people out there who think they know you, but there's so much in you they really don't know. And you'd like to keep it that way.
Some say that having scores close to the divider (here being 0) is a sign of personal conflict or growth in progress. I'm not sure if that's the case, but it would be interesting to know if it's true in your case.
Sensing people are usually the kind of people who expect things to be as they normally are. And actually I think "normal" is the word of Sensing people. Not that they would be average by any means, but they tend to see the world around them through expectations. Sensing people thrive on normality.
Intuitive people on the other hand expect less and 'see' more. They are less likely to take the matters for their face values, and want to see what's behind the curtains. Consider a grand scale magic show. Sensing people would concentrate more on the show it self, marveling at the grandeur of the trick, while intuitive person would marvel at the distractions and all the manipulations the performer has to do for the show to be successful. At the very of end of Sensing are the people who only see what they are shown, and at the very end of Intuitive are the people who only see what they are meant to be shown.
You seem to have a little bit of a preference for personalizing things around yourself. Everything around you is little bit of you. To mock your friend, is to mock you. To mock your ideas, is to mock you. You might consider it important how people perceive you and each other. It's not that you would not be rational or overtly emotional, it's just that you consider matters of opinion and values more important than machine-like rationalizations.
You like to know things in advance, and feel the need to be prepared. You try to act wise and avoid rash actions. Catastrophes are best avoided by scouting ahead. And you hate doing mistakes. You might not even be a big believer of chance. You'd rather be safe than sorry.
EDIT:
By the way, we have very similiar scores.

-Strong introversion
-S/N border-case
-J around 30%
-You have F around 30%, I have T around 30%