How could a psychologist be so wrong?

Ok so many years ago I was diagnosed with Asperger’s, but also in the diagnosis he said I was intellectually challenged and would never be able to live on my own. I would have to be on disability cause I couldn’t work. Ok so fast forward many years. I have worked my way to assistant manager In my company I have lived on my own, myself and my girlfriend now share a place, lastly I’m a few semesters from having my bachelors degree. So I guess my question is for as much education it takes to pursue being a psychologist how can someone be so wrong in so many different areas

How could a psychologist be so wrong?
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