Welcome to Wrong Planet.
I'm not officially diagnosed either, and yet I share so many of the classic traits (especially typical female traits) that I can't help but feel more of a link to most users here than I ever have to my peers.
Some of us older folks didn't attend school in a time when this diagnosis existed. As a result, it seems after much self and soul searching our entire lives, when we find this, suddenly it all fits together.
I'll be completely honest with you - there are times I feel like an outsider here too because I'm not professionally diagnosed (yet), but for the most part, everyone is very understanding and welcoming. And users here are more honest than people I've ever known in person.
I don't have official stats for you, but I'm sure at least 30% of users here are self Dx (or pre-diagnosed, as I prefer to refer to it). And some users are neurotypical who have an Autistic or Asperger's person in their lives.
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Aspie score: 161 of 200
Neurotypical (non-autistic) score: 38 of 200
Autistic/BAP -123 aloof, 124 rigid and 108 pragmatic
Autism Spectrum quotient: 41, Empathy Quotient: 19