I've recently been stuck in some cycles of indecisiveness considering my own career situation, so I understand how frustrating this cycle can be!
First off, I want to address some of the type of thinking I see in your post. It sounds like you're kind of stuck in some black-and-white thinking
. For example, you seem to think that the decision of where to live that you make now is the decision you have to stay with forever. But that's simply not true! I know it can feel like it when you're so young, but you can always apply for different jobs, move, save up money to move without having had a job lined up first, etc. There's still so much time in front of you. There will be a lot of changes throughout your life. Make your decision now for what's best for you now. You can always make a change later when you're in a better position to do so! You also say you're worried about work because then you won't have time for the political causes you enjoy, which makes it seem like you think it has to be one or the other: work or political activism. Plenty of people manage work and volunteering/social lives. While it's true that we do overwork and you will have less time for volunteering and protesting if you work, going to work doesn't mean working 24/7 and having no other life. You can also juggle things by doing things like: looking for jobs with flexible schedules, working hard for a few years to work up to a position where you have more flexibility to take more time off for your volunteer commitments, living on a tight budget and working a part-time job, and/or getting a job that's involved with the politics you're involved in.
So! You've got a lot of thoughts going on regarding this situation. Have you sat down and done a pro/con list for each decision? Writing all this down in a clear and organized manner might help you see it in a new way (maybe there's a lot more pros or a lot more cons for one that you aren't realizing or such) or just help your thinking slow down so you're able to more confidently make a decision.
After that, I would sit down and look at things very logistically and practically. What would you need to stay in the city you're at in a new flat? By when would you need a job and what would your rent limit be with a minimum wage job? Can you find a job and a flat by the time you need to move out of your current place? If not, can you set yourself a schedule to applying for jobs and searching flats while you're living with your family for a couple of months or so? Or do you have something lined up with your family already? Can you commit to doing that for six months, a year, or how long? With cost of living, how much can you afford to put aside for savings to help be a "moving fund"? With how much you can put away, how long do you need to save up for before you can afford a flat elsewhere?
Sitting down and seeing logistically and practically what you need in order to stay/move might help you see what decision you have
to make for now, even if it's not the decision you really want to make.
To me, it sounds like you know what you really want to do, you're just not sure how to make it happen. I think doing the two above suggestions might help you sit down and work out the practicalities so that you can make some decisions. With some forethought and practice, you'll get better at managing these sorts of situations. Have some confidence in yourself and your abilities! <3