OK, that's a little harsh to my coworkers: I get along with them well enough, and after I or they leave the company I'll probably add some of them on Facebook, but that doesn't change the fact that I have no energy for people I know outside of work.
On the occasion I do have the energy to go out to a bar or something, then I have to choose between socialization and spending time on my hobbies. I can spend a few hours after work at the bar... or I could spend them at home reading more of a novel or hacking at one of my personal projects. Back when I was in college, I had plenty of time to do both. I could hang out with friends and then go and do stuff on my own at home. Now that I'm out of college, I have to choose, and having to choose sucks.
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.
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.
And this is why the weekends are typically much busier than weekday evenings at restaurants and other social locations.
Honestly I find all types of commuting exhausting in different ways, except possibly a medium-to-long trip on a nicer train, where I can use my laptop (mostly) how I would in a hotel room.
It will probably never happen, but in my view the next major worker's rights advancement should be some kind of amelioration of the commute factor, either by employers or the government. It's probably more than half the reason I left my last job.
I've always believed that making things 'feel more fair' tends to motivate at least some workers to put in extra effort more enthusiastically.
Also, no one is ever stuck. On your time for self care you have to make an effort. This is a lesson you simply have to learn. I know I have.
I'll sit and have hours-long conversation with other parents of my kids' friends'. Pretty meaningful conversations. I'm not even entirely sure of their names.
My lifestyle is already shifting me out of the no-kid lifestyle (and therefore friends who don't have kids) by default.
You neglect the other 8 hours in a day, and you aren't alone in that. I have a ton of coworkers who do their 8, go home and watch tv and have a beer, then go to bed.
Meanwhile I'm going on short hikes, taking classes or hitting the gym, or going to shows and meeting new people.
With kids, the equation is obviously different (at least the eight hours of sleep portion) but you can take the little one to the park, to play dates with other kids, and occasionally non-kid focused events (the last beer fest I went to seemed to have several kids running about).
At the end of the day you have to prioritize how to spend your time and use it fully. It is harder then just watching tv and having a beer, but much more rewarding. Take classes, volunteer, be social. Your time is limited, always use it well.