Gary Speed confessed that Wales would need to learn from their defeat to England after being 'killed' by Frank Lampard's early goal.
Lampard scored from the penalty spot after just seven minutes to demoralise the hosts in Saturday's crucial Euro 2012 qualifier at the Millennium Stadium.
Darren Bent quickly doubled England's advantage and Speed admitted after the match that his men found it difficult to regroup.
However, he felt there were positives to take from the way Wales battled hard in the second half in an effort to get back into the game.
Having now lost their first four games of the campaign, Speed believes the most important facet for the players to address is their state of mind.
"I was disappointed with the first-half performance," Speed told Sky Sports.
"We are a developing team and we are used to getting beat really and we haven't got that winning mentality at the moment.
"To lose a goal in the first few minutes killed us and for the next 20 or 25 minutes we struggled a bit."
Speed added: "The way we came out in the second half and tried to play and get on the ball, showed some spirit which bodes well for the future.
"Like I say we are a developing team and hopefully a year down the line we will look at this game and have learned a lot from it."