When I told my mother I am HFA (diagnosed at age 35) she said "You can't be autistic- you're not ret*d!" Unfortunately, my parents did know that I had a number of issues as a child, but they never were able to put the pieces together. This was in the 1970's and 80's, when there was very little information available for educators and health professionals regarding kids with HFA. I was verbal (though hyperlexic, which means yes, I'm verbal- but in a mostly written, and sort of disjointed way) and was able to achieve academically, but I had severe issues with social skills, anxiety and depression, as well as I have gross motor deficits.
Sometimes parents believe the stereotypes that go with autism- that everyone on the spectrum is non-verbal or has severe cognitive deficits, or that people with autism can't possibly function out in the normals' world. The truth is that some of us learn to function very effectively in the normals' world because we have the intellect to do so, and we have discovered how to navigate our own road maps to get to where we need to go.
The best thing you can do is to learn how to work with the road map you have. Get all the information you can on Asperger's/ HFA / autism so that you know what you're dealing with. Your individual wiring is going to be different than mine, it's going to be different from the normals that surround you, but it's yours- and you can learn to use it to your advantage. Age and time are your friends in this endeavor, and it does get easier as you get older and get more experience.

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Intelligence is a constant. The population is growing.