Contact Stepchange debt charity.
They can offer you a free debt management plan.
I got into debt like you at 18 when I first worked etc and I racked up 20k by the time I was 24. In just under three years, I cleared it all by this summer just gone.
I felt like you a failure and thought because of my age at the time, really depressed.
Contact Stepchange and they'll help you.
Do you have any family and friends that could help with childcare when you could work?
Could you retrain and go to uni for a career as a mature student?
I know with a job under 16 hours a week, you can get top ups from universal credit but I know how hard it is to find a part time job.
Write down all your outgoings on a spreadsheet including like subscriptions.
Cancel the ones you don't use.
Find a better energy tariff, phone tariff (maybe go SIMO) and other utilities.
Then after you've took money off for food, see how much you've got left and then divide it by how many days in the month. Use only that amount etc.
That helped me clear my debts etc in that time.