Trying to explain to my parents about moving out for university + maintenance loan

What do they include in the £800 a month???

my food, necessities, going out. Im not even a massive spender and I know how to make money work if I need to 🫠 I think might do a weekly shop for myself to show my parents

Hello everyone!!
I am writing down this post just trying to get some perspective on things. I am hoping to apply for university come this September for Biochemistry, and I think my main choice will be Bristol due to the fact they offer it with molecular biology and biotechnology, if not I am thinking about Cardiff, Birmingham, Nottingham, Leeds or York. For some background I currently live in the north very close to some of these universities after moving from a small city in the midlands a few years ago (Not saying because I don’t want to doxx myself but this town is in the middle of Cardiff, Bristol and Birmingham each way haha).
My parents (more so my mum) really want to move back to our hometown for when I start university, and I feel as if I am being pressured to pick Bristol, Cardiff or Birmingham, despite the fact that all of my friends are planning to stay up north for university and my friends in my hometown are planning to move away from there for university themselves.
Now I know I just said I want to go to Bristol and sound like I am contradicting myself, but I want this to be on my own terms. my parents want me to stay home for university upon moving back to my hometown for fears that I would be isolated living in student accommodation and I would have zero money as my calculated maintenance loan will only just about cover my rent and nothing more. My parents also have two other children and have already said they will not be able to help me majorly.
But I feel as if I am going to end up even more isolation staying in my hometown due to the fact the train from there to bristol is an hour and a half one way, so I won’t be able to stay out late as I’d have to make sure I don’t catch the train late, etc. Train tickets will end up spending my entire maintenance loan anyway, so why not use it to live closer to university?
I just feel like moving back home and going to a university near is going to cause more harm than the good my parents think they are doing by keeping me at home for university due to their own fears. They think I would need £800 a month for food and necessities??
I am just incredibly worried I am going to end up with zero social life in university no matter what I do by moving back. I am the first in my family to be considering university and this all feels incredibly overwhelming at the thoughts of having to leave my whole life behind north because of what my mum wants to do.
I love Leeds and York, and love the idea of studying there, especially considering they seem really good for biological sciences, but I don’t think I’ll get this opportunity if my mum seems as set as she is now. I also don’t see why she needs to completely disrupt not just mine, but my little brother and sister’s lives and friends here to move 200 miles across England, rather than waiting just a bit longer for us to finish education, and taking opportunities away from them to a hometown of practically none.
I think the only reason I am considering halls is to avoid moving back and keep trying to find reasons aside from that to justify myself. I truly do not know what to think anymore and I just need some perspective on this, whether I should just work with my parents to stay home or keep looking to move out.
Sorry this is a really long post, but I needed this off my chest!!

There's no way you'll spend £800 a month.
Have you tried listing out the costs of living at home vs. in student accommodation? If you can show them a spreadsheet showing that the costs are broadly the same and then explain that being away from home is an important part of the experience, they may realise that spending all your money and time commuting 4-5 days a week won't necessarily be the best.

I am planning to do that, as I simply do not believe I would spend that much (Itd pain me to do so) Its so hard to explain to someone who’s never been to university and made these assumptions what its like.

I currently have a part time job (working 4 hours 7-11 on a saturday and sunday, If I could find something like this I think itd cover my living but they think id need to work 16-24 hours??