I got a car loan years ago to be able to buy a car.
I got it through welcome finance and it's £250 a month ..the car was worth £4,500 and I'm paying back over £11,000
I'm afraid that this shows that you lack financial capability. You're paying more than 2.5 times the value of that car, which will be next to worthless before you've finished paying for it.
Welcome Finance have gone into liquidation, iirc a lot of their loan agreements were unenforceable, and they were a finance co known to lend to high-risk borrowers.
Have you started a PPI claim? The compensation scheme has paid out a lot on Welcome loans. You might get enough back to put a chunk towards rent in advance or pay off a big chunk of your debt.
You need to work (take a second job if you can), save and clear your debts. Then you can start rebuilding your credit history: take out a credit card like Aqua, which even people with poor credit can often get, use it for everything for a couple of months and pay it off in full every month. Then do the same with a cheaper interest card.
There's loads of advice about how to do this online.
It's harsh, but the combination of bad debt and renting is a toxic one and this is the only way of overcoming it.