How much interaction do you have with people through the day?
My only interaction today with another human at work was: "Hey buddy, do you need this done by tomorrow or does Monday work?"
I realized I only spoke the mentioned one line all day today. And this is not unusual. Most days are spent writing code, evenings are spent in the gym, watching a Netflix show, and walking my dog. I stay by myself.
Trust me, I am not socially awkward or depressed. I like my space though. A few friends ping me over chat so I am in touch. But is not having any face to face social interaction through the day really a red flag?