People skills come naurally to some while for some others, there is a learning curve here. People skills are skills and hence very much learnable.
The minute we see ‘social skill’ as something that is not naturally inherent in someone but something that can be acquired and developed for particular situations (introverts make for great stage speakers/presenters), we are approaching this more scientifically and less emotionally.
Susan Cain, in her book Quiet, describes presentation, expression and social small talk as skills that can be learnt.
It is true that natural extroverts have it easy in this space but that is not to say that these skills are supposed to be inherently present in each of us us for us to be a particular way.
Like most things, social skills can be learnt and practised over time. That is oddly comforting.