Hi Theansweris42, sorry to hear that you've run into an administrative block with your school email, which I assume your parents monitor? In terms of writing things down privately first, could writing a draft of what you want to say in your private email drafts help to keep it private, even if you'd need to say it in person?
When it comes to university whilst living out of home, whilst I don't know your exact situation where you are in Europe, my understanding is that there are free public universities (that are prestigious) in your country, and that's great you have a scholarship (which might also mean you go free, or they give you a small stipend?). Also, the university likely have student advice services that could advise you on how to access any student financial support, student jobs, working out how much you need to move out, other advice.
As someone who lived in sharehouses during uni, I'm going to dump a bunch of things you can look into in terms of supporting yourself, in your own time, no rush! I hope some are applicable in the context of where you live - you may have to talk to some older friends or resources to get perspectives from students.
Is living with other students in a shared rental flat something that people tend to do in your country? Many people around the world work in a cafe, supermarket, retail more generally to support themselves through university and sharing a flat or house with a few other people can be crowded, and student flats rather basic, but if you can find some solid people to live with, can be a good life experience.
Other forms of income for uni students can be working on campus (student cafeterias), and some universities (and or student union groups) host jobs boards, which can include opportunities to tutor high school students (another option is to mention to teachers that you'd like to advertise to parents at your school that you can do tutoring in the subjects you do well at). Also since I recall you're a musician, depending on the level you've reached, giving music lessons can be a good niche way to make money (most music undergraduates are doing this), and also if there is a shop that sells musical instruments in the area, they tend to employ people with music experience, which can be a smaller pool of people to compete in. Also, are there periods, say around Christmas, where stores take on more people? If so, sometimes the people who work in those roles then can stay on if they do well and want to stay as there is a lot of turn over in student-heavy industries as people graduate and leave.
Another thing to consider is whether you take advantage of your great placement in a university, but study part time (aka complete the degree over longer than the regular duration), so you can work more hours in a job to have more income to support yourself in needs be. Do research this carefully as sometimes certain government supports or student discounts require full time study and it's a net loss to work more.
Finally, even if student days are tight financially, it is a short period of time, and won't be your forever. Also there generally tend to be free things on campus with student groups, even just hanging out with the friends you will make between classes. There are usually also free student clubs also.
I have done some googling and whilst I can only read your government sites that are available in english, it seems like there is a housing allowance
you could be eligible for in a share flat, and some of the universities offer housing bursaries.
I hope this gives you a bit of hope and isn't too overwhelming. It can be a bit scary thinking of having to support yourself at 18 or 19, but there are options out there.