One important step IMO - don't own it. Ie. don't let these girls define you or your self-esteem. If you do, you'll play right into it. Its not that they're meaning to trip you up, people are flighty and yes, you have a neurological condition that effects your affect - they can see the surface but not the reason. What they think they're seeing - they're not. Is it likely that they'll never figure out the difference? Very possible if they keep seeing the same thing.
I've noticed that I was able to make great strides just by refusing 'creepiness' as part of my identity, I've also gone to great lengths to ignore nonverbal rebukes or cold stares if someone's reading me that way, I used to think that they were 99% of the time in the right and that I was the problem, now I know that if you act as if registering that isn't even part of your makeup (so long as you do it in a confident rather than an oblivious geek sort of way) it'll dissipate more readily, they'll get cues that what they think they were seeing is incorrect and they'll more likely question themselves at that point. Even now, as my chemistry ebbs and flows, there are times where I seem very normal and energy back from people is mostly positive, there are times that my brain chemistry has the drop on me, I look like Dice Clay without his leather jacket, and - people tend start digging in nonverbally or start eyeing me up like I'm a liability. I have to remember - either way - I'm still the same person, regardless of how much the later sucks. That much I don't think will ever go away, so it comes down to damage control and getting good at it.