I'm sure that if you make any eye contact during conversation it marks the rise and fall of shared attention even if the correlation is lesser or maybe a lot lesser for you. Unless you're saying you do make eye contact but it's when your attention has lapsed, which I doubt is what you're saying but correct me if wrong!
That said I've personally almost never made eye contact in 42 years of life, but I do look at mouths which nobody has ever noticed isn't eye contact, and I'm sure serves the same purpose. If all you ever do is look away, it would be interesting to hear if you think there are other things that might serve the same "signal shared attention" functionality for you.
I'll also note that autism isn't the only way to be atypical, and sure wouldn't be surprised if eye contact signals shared attention just as much in ADHD folks as in neurotypical folks (but would be very interested in finding out if that's true or not).
That said I've personally almost never made eye contact in 42 years of life, but I do look at mouths which nobody has ever noticed isn't eye contact, and I'm sure serves the same purpose. If all you ever do is look away, it would be interesting to hear if you think there are other things that might serve the same "signal shared attention" functionality for you.
I'll also note that autism isn't the only way to be atypical, and sure wouldn't be surprised if eye contact signals shared attention just as much in ADHD folks as in neurotypical folks (but would be very interested in finding out if that's true or not).