The only reliable way to find out if you have AS or not (or whatever) is to do excessive reading on it. Articles, blogs, WP, other autism related sites and books, etc. Look for other mental disorders as well. On top of it I felt the need for "proper" professional evaluation, so I applied for it, and currently I'm going through the evaluation process. Beside I hope for getting some help with it, I feel similarly to Todesking. If you are unsure, I'd recommend these steps.
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Another non-English speaking - DX'd at age 38
"Aut viam inveniam aut faciam." (Hannibal) - Latin for "I'll either find a way or make one."