Since you're female, I would suggest asking some of the male co-workers if you can sit with them. Be careful that they don't get their hopes up and think you're trying to flirt with them. But if you ask politely and sincerely, I'm sure some of the men would be than happy to accommodate a shy, quiet woman from the office.
From what I've read about women with AS trying to interact with NT women, it's probably best that you don't try to join one of the "girl's clubs" at lunch. Just find a few well-mannered men and they probably won't mind you sitting with them.