Dan Pitt, 25, who has been on universal credit for several months, spends 25 hours a week looking online for work in the Mountain Ash area - ideally in an office or reception.
Unlike those struggling with rent, he lives with his mother because he can't afford to move out. He would ideally like to work in Cardiff, where there are more jobs, but has to weigh up the cost of living or travelling there against what he might earn.
"It's Catch 22. It feels like I'm stuck, stranded in the valleys. I can't be a care assistant, I haven't the qualifications, I could probably be a receptionist. But when you click on it, you get a temporary contract but I want a real stable job," he said.
"People on contract work are being underpaid - it doesn't cover living costs, food, gas, electric. I want to be able to sort out all my bills and live independently. I haven't been to a pub in a long time, I can't afford to go out with my mates, even Costa for coffee. I'm in debt already."
The DWP said 18 to 21 year olds were now being offered an intensive support package, to help them get into work, which meant young people were better off in work under universal credit.
On the rents issues raised, a DWP spokesman said: "These comments fail to recognise that from April anyone in receipt of housing benefit who moves onto universal credit will continue to have their rent paid for two weeks during the wait for their first payment.
"This will help people keep on top of their rent payments as they move onto the new system.
"Universal credit is already in every jobcentre for single claimants, and we are rolling it out to a wider range of people in a safe and controlled way. And it's working. With Universal credit, people are moving into work faster and staying in work longer than under the old system."