I thought the same thing. Perhaps it is because I work for someone else instead of for myself, but since I've been full time remote for the last 2 years, I've had 0 free time for anything. I rarely leave the house. Pretty much everything I need comes from online purchases or grocery delivery as I don't even have time to do that.
Before I worked remotely, I thought that working remotely would allow me time to exercise and eat better. I had dreams of going on a daily bicycle ride, instead of being stuck in my car.
The reality is that working remotely just allows me to put in insane amounts of hours. About once or twice a week I'll start my workday at three in the morning due to insomnia, and just work 12-16 hours straight.
I think this is particularly prevalent when the entire team is working remotely, because ALL of us are wrapped up in this crazy schedule.
tl;dr; you have to actively work to develop these habits because it's easy to just sit and work the entire day
You pretty much have to do it at some point unless you think you can happily spend the rest of your life like this. I'm working with a primarily remote working people, and yes - due to flexibility sometimes people get caught up in something and work later. But mostly we're telling each other that things can wait and to go offline. Normally we all still save time since there's no commuting.
I told my clients that the largest number of productive hours you'll get out of a developer in a day is six (which I believe to be largely true) and that's how many I worked. Start at 9am, you're finished by 4; most of the places I worked the commute was a 15 minute scooter ride and I'd have the rest of the day for swimming, learning guitar, doing my own projects, etc.
I actually moved back to London for a short time because I worried I was getting too relaxed.
Second are you sure you're compensated sufficiently? You should be able to take time off with that money you earned?