Look into tri-type, it may be more relevant to you than looking at your wing. The wing is adjacent because that's how the system was designed, there is no science to any of it.
"While it is quite uncommon for Fours to mistype as Seven, it is not especially unusual for Sevens to initially mistype as Four. In addition, from an external point of view, more extroverted Fours, primarily those with the Three wing, can, in some settings, look like Sevens and artistic Sevens might resemble Fours. This is because both types can be creative, unconventional, attention seeking and even flamboyant in their presentation. Nevertheless, Fours are far less extroverted than Sevens who truly seek out people as a principle means of distraction. Fours are comfortable with their negative mental states, even sometimes choosing to inhabit them, whereas Sevens are in flight from pain. As a general rule, Sevens tend to overestimate the extent of their suffering and sadness because they find such mental states to be so threatening to their sense of self; they can therefore think of themselves as being more melancholic than they actually are. The melancholy of type Seven is primarily driven by anxiety however, whereas that of type Four has its roots in a feeling of worthlessness"