A relatively short Scientific American blog about correlations between well being factors and preference or enjoyment of solitude.
As you can see, sociability and introspection aren't opposites; and can actually be in harmony with each other. This finely-grained analysis shows that it's worth making a distinction between (a) having a preference for solitude, (b) enjoying solitude, (c) enjoying introspection and reflection, and (d) nonconformity/dancing to the beat of a different drummer. These four variables do tend to be positively related to each other, but scoring high on one doesn't necessarily predict that you will score high on the others. In fact, without any additional context, just having a preference for being alone (vs. spending time with others) seems maladaptive, whereas embracing alone time seems to be related to psychological health and an active fantasy life. Far from being at odds with sociability and positive emotions, solitude and introspection can lead to a life full of connection, creativity, and meaning.