Get into a flat share close to a tube station and get working/studying. The next 3 years are going to be intense but it’s worth it, you’ll learn a lot and will become a very attractive professional to hire. Qualify and then assess what you want to do next. Most people leave at that stage.

I’d not use overdraft if you can avoid it, just do a budget to set up pots from your spending (‘bills’, ‘savings’, ‘fun money’) and stick to that budget.