Yes, I'm an so-dom.
I think though that for much of my life I haven't been the healthiest example. That, and/or the introversion really skews the so-dom-ness, makes me more neurotic about social things, with some of the push-pull mentioned in the OP.
I can 'turn it on' and fit in if I focus. Be more chatty - BUT - in an asking-questions way, getting others to open up/share -- not a divulging-sharing way where I'm doing so.
I think for me the push-pull ties to a)Social anxiety (which, tbh, I think is a huge reason I'm so-dom -- I'm so preoccupied / aware of whether or not I 'fit in' or not) ; b)My simply not feeling I have much in common with a given group of people or whatnot, thus little perceived ability to make any meaningful connections. So I can tend to isolate myself as a result. It's a lifelong challenge/ learning thing. I'm not going to pretend I have a big social group, because I don't, but I do really value / desire the notion of having a group, a sense of community and belonging/ shared interests and values, even if I haven't really ever had one. It's weird. I could probably write more but am not sure what to focus on.