Steven Finn admits England are hurting after gifting back the Ashes to Australia.
The Middlesex bowler has been unable to force his way into a Test team who have failed to get anywhere near taking 20 wickets in any of the three Tests so far.
Chris Tremlett was the only paceman who has managed to support new-ball pair Stuart Broad and James Anderson with the tourists then turning to an extra spinner in Adelaide and the fit-again Tim Bresnan in Perth.
Broad has yet to demonstrate his recovery from the foot injury he suffered at the WACA, so there is likely to be at least one bowling change for the Boxing Day Test in Melbourne.
"It's been very frustrating," Finn said. "It's quite obvious that the bowling hasn't quite gone as I would have liked it to. I've been working as hard as I possibly can and bowling as many overs as I possibly can in practice in the nets, trying to get it right.
"But it hasn't happened yet."
Finn has not featured for England in Tests since he appeared to be the weak link as they eked out the narrow victory at Trent Bridge which set them on the way last summer to their 3-0 win over Australia at home.
He has spent much of his time since trying to work through difficulties in the nets, having made several changes to his method since eradicating a habit the previous year of knocking over the non-striker's stumps in his delivery stride.
"I feel I'm moving in the right direction and I feel I'm getting there," he said. "But it hasn't been right up to this point, and that's why I haven't played."
Instead, he has been powerless to help as his England team-mates took the fast track to series defeat here.
"I think everyone is disappointed and gutted we've failed to retain the Ashes," added Finn. "That's what we wanted to do when we came here.
"Everyone wanted to do that, but it hasn't happened for us."
Finn insisted that England could put their disappointments behind them, and focus on the chance to hit back in the final two Tests in Melbourne and Sydney.
"We've had a few days to clear the air and clear ourselves of as much baggage as we can - and we go into these next two Tests trying to win them and make it 3-2 in the series," he said.
"We're playing at two of the best stadiums in the world.
"There will be 100,000 at the MCG on Boxing Day, and then the SCG is one of the most historic grounds in the world.
"I don't think it should be too hard for people to motivate themselves.
"These are still Ashes Tests, too. The series has gone, but there's a lot of pride at stake."
You can watch all of the fourth Test on Sky Sports 2HD, from 2230 on Christmas Day