I have no family to speak of, and I don't have any acquaintances outside of work. And I've never met any of my colleagues face to face. Many of whom have never seen a photograph of me. Most of our interactions are in Mattermost chats, emails, or work items. Most people only know me as ASCII codes rendered on a screen to form words.
If that doesn't qualify me as a shut in, what does?
>To be a shut-in is the inability to access the full spectrum of what life has to offer.
My response to that would be to ask why such things would be appealing in the first place. Why should one that finds no reward in dealing with other people at all, aspire to being promoted or falling in love? Both of which inherently require dealing with other people.