In general, stamina (social, mental and physical) is like a muscle. The more you train it, the better shape it gets in and the more work it can do before it's exhausted. Start with something small like reading a book in a coffee shop after work, or meeting a friend for dinner and a beer. Slowly do more over time.
Just like you wouldn't go to a gym and deadlift 300lbs cold, you're not going to get off work and run a social club in your free time - but if you put in the consistent work, you can absolutely get there.
> but if you put in the consistent work, you can absolutely get there.
I'm guessing you're right - you _can_ do it (the same way people in medical residency can force themselves to work 80 hour workweeks), but will it ever feel pleasant and not like a chore? I can go out with friends in the evening after work, but I'll be a bit slow and groggy.
To continue using the gym metaphor - there's often times an initial hurdle, but once you're actually socializing and out there, you have a good time and you feel good afterwards.
Just like you wouldn't go to a gym and deadlift 300lbs cold, you're not going to get off work and run a social club in your free time - but if you put in the consistent work, you can absolutely get there.