That whereas I previously believed I was socially competent I now know I'm certainly not. Having trouble finding a GF, being ghosted by friends for no apparent reason, misinterpreting other people's feelings leading to conflict -- all those things slowly got their explanation as I found other people struggling with the same problems and perceiving themselves in relation to those problems in a similar, albeit not identical way.
Finding a way to "ground myself" in a world that generally doesn't think or reason the way I reason. That I'm (usually) not wrong but seeing things from another perspective.
That sensory problems are a real thing and that not everyone feels pain or discomfort from bright sunlight and walking on sand.
That not being able to get a driver's licence doesn't necessarily boil down to incompetence, but difficulty bringing together a lot of sensory information appearing in rapid succession. The person could be a math genius otherwise. (I do have a driver's licence but that was mostly luck -- I don't/can't drive unless I've driven the particular road in question a 100 times before.)
Among others.