I realize that there are four Shadow functions, and that these include the four functions that are neither dominant, auxiliary, tertiary, nor inferior. However, there is only one Shadow function that matters to your individual grouping, and that is your dominant function's Shadow opposite.
The Shadow opposite is the function with the opposite attitude as your Dominant but with the same preference, for example, Fi to Fe, or Ti to Te.
The Shadow opposite is the function that gives you the most trouble without your awareness of it even being a problem.
For example, I know that, for an INTP such as myself, Fe is an issue, and that I often move contrary to objective social values. However, I do so with full consciousness of this fact. I am also conscious of the fact that I am different and that others see me as different. However, I also seek to escape from the Fe dilemma in my life because of how consciously painful the entire social realm is for me.
A Ti-dom, having conscious awareness (at least to a degree) of this problem, can also control it to a degree. There are many outlets of escape, such as books and video games. Video games in particularly give a sense of accomplishment that is far easier and quicker to gain than any real-life achievement. And since most of those achievements involve some kind of social competition, it is easier just to drop out than to face losing again.
When your Shadow opposite is personified in real-life (exemplified as the bully archetype versus the nerd archetype), the bully is not only telling us something about himself, but also about you (the nerd, in this case). He is telling you to stand up and face your fears, and moreover, he is trying to make you more conscious of them. I know that the vast majority of the time the bully is blamed, although he is just a tough person trying to face down his own fears instilled by a parental figure ("my son won't be gay," "my son won't be bullied by others," etc.). But in another way, the nerd brings it upon himself for being a nerd, that is, someone who hides behind scholastic achievements or, at its lowest, earning "achievements" in video games.
We also have an "inner bully" that chides us continuously for not facing our fears, and that is our Shadow opposite.
I would like to know, how does your Shadow opposite - your "inner bully" - affect you?