You're pretty much in the same boat as me apart from the changing countries aspect. I'm also 20 and still not in University but we're still young man we can still do almost anything we want. I'm currently self studying my A Levels and it's proved difficult to keep focus but I just make sure to get it out of the way for the day before any other tasks such as the gym and reading. Then when you have nothing else for the day just allow yourself an episode on Netflix.
I'm treating my procrastination just as I would for a cheat day on a diet. Every Sunday I just stay in bed all day and watch TV and browse the internet. At first I was just excited all week at the thought of being able to do nothing for a day, however a month in I found myself bored on the Sunday, a part of me felt unproductive and I done some studying instead, couldn't believe it.
Now you need to get back to the gym right away, don't just do your own thing either you need to get a set routine to work by, so it's the same days week in week out. As for the Education part there are many Higher Education courses out there that enable you to take one year at college then straight onto University, look for that now instead of browsing Reddit. And since you sound exactly like me I'm going to assume you're depressed, get yourself to a psychologist. Get out the house more, haven't spoke to friends for a while? Invite them out for the pub.
Also one more thing that I've noticed, stay away from videos/pictures/quotes etc that offer instant motivation, all that shit does for people like us is give us a few minutes of false hope that we can just get our shit together instantly, then the next thing you know we're back at square one wondering where it all went wrong. It's a long and enduring process but there's no better feeling than going to sleep at night knowing you've worked your ass off.
Enjoy the grind man.