How to stop family from using my bank & money before uni?

Ever since I’ve gotten a bank card my family have been using it to transfer money into, take cash out of, use it for contactless payments.
This is mildly annoying,, and makes it hard to look through my bank statements or know how much money I have in my bank at any given time. Recently, my mum has somehow given the wifi company my bank details, and they tried to take a payment out this week. this was without me knowing. My family know my pin, take my card to use it without me knowing, which means I never have it on hand.
That’s fine, though. I can cope with it.
The most annoying thing is that I keep “lending” my mum money. I get about £60 every two weeks. She constantly asks me to lend her money. Even though I have an older sibling who doesn’t pay rent or anything who gets SO MUCH more money than I.
This is constant, EVERY time I have money she asks to borrow it. I can’t save money. I’ve got £15 and she owes me atleast £100. I get grants and scholarship for uni, which will give me about a grand a month. I need to save money for my postgrad, moving out etc. I’m worried that this will worsen when I start to get more money. I’m changing my pin and card details, soon. but I feel like they’ll just find a way to convince me to let them keep using it.
I’m really frustrated because I rarely even get any money, the £60 is rare bc I need to have 100% school attendance for it. They manage to cope just fine when I don’t get the £60, but somehow, randomly, coincidentally whenever I rarely get it, they NEED to borrow it. I really need to save up money, it just feels like I never make any progress because I never actually have MY money in my bank.
I don’t know what else to say to get the point across, I can’t move out yet or anything. I keep saying and hinting at my annoyance but it’s brushed off as a joke.

My mother was a single parent who financially abused me when I was young and up until her death. Your problem is the perfect summary of financial abuse. You need to put boundaries in place, do not lend your mum anymore money, change as many details as you can.
I'd recommend calling up your bank and explaining your situation, they will report your card as lost or stolen, they will send you new information through the post, please consider opening up a PO box so your Mum can't open your mail. Consider changing your details, maybe even change bank. I'm with Santander, they have a new security measure involve which is "your voice is your password".
Join a credit score company, I use Experian. Go through your credit report, when I first joined Experian and saw my credit score was so low. I discovered my mum took out £20,000.00 in phone contracts, loans and credit score in my name. Please protect yourself.

Did you do anything about the £20,000 being taken out in your name? Could you report it somehow?

My mother was a single parent who financially abused me when I was young and up until her death. Your problem is the perfect summary of financial abuse. You need to put boundaries in place, do not lend your mum anymore money, change as many details as you can.
I'd recommend calling up your bank and explaining your situation, they will report your card as lost or stolen, they will send you new information through the post, please consider opening up a PO box so your Mum can't open your mail. Consider changing your details, maybe even change bank. I'm with Santander, they have a new security measure involve which is "your voice is your password".
Join a credit score company, I use Experian. Go through your credit report, when I first joined Experian and saw my credit score was so low. I discovered my mum took out £20,000.00 in phone contracts, loans and credit score in my name. Please protect yourself.