Ambivalence wrote:
How could you not? Diagnosis requires significant - noticeable and disabling - symptoms.
Self-awareness.
I have significant - noticeable and disabling - symptoms from at least two disorders, and yet I didn't realize that this is what they were because a) My mother never said anything to me about how she was trying to get me educational accommodations so I could function in school, and b) the only reference she ever made to the possibility of any disability was how she triumphantly proved to my first grade teacher that I did not have a learning disability, which resulted in me actually having little to no support throughout school. So my family didn't tell me what they observed. Oh, she didn't mention that someone suggested to her that I was autistic when I was a child.
I was also raised with mixed messages that I was stupid and lazy, and that I had a genius intelligence. Since I couldn't function well in school and was constantly punished for not functioning well, while being told how stupid and lazy I was, I absorbed a lot of that. I didn't seriously realize this was wrong until I was on my own and could get very good grades with little effort. The problem was sustaining that work for more than a semester or two before crashing and burning. So, then, I went back to being lazy, sabotaging myself. Instead of working out that I was disabled, I worked out that I must somehow be doing this to myself, holding myself back.
Beyond that, I seem to have trouble noticing things when they are not explicitly pointed out. I can realize I have trouble with things, and not think about the possibility that other people do not have the same trouble - I just assume they cope with it better. I didn't think that I lacked some of the skills to apply the same skills everyone else uses.
I still have trouble seeing my deficits as deficits because this is how I've functioned all of my life. I don't have an alternative frame of reference that shows me how other people function. I can only see the results of their functioning. I don't doubt my diagnosis at all because it makes no sense, but lacking a coherent description of what it's like to be autistic, I probably would not have figured it out. Maybe someone else might have.