I would put that in the introvert spectrum. Complaining about "shallow" interactions is, I think, a big telltale sign of introversion.

I wouldn't call deep conversations a form of socializing, like being alone, this is a bubble, except this time, there are several people in the bubble. Extroverts don't like bubbles, and I am sure deep conversations are draining to them (I am not one, so it is just a guess), and they may want to break free of them, for example, by bringing in other people. On the contrary, in social situations, introverts will want to form the bubble as soon as they can, keeping the small talk and all that to a minimum.