The Blaugrana defender has admitted that his team-mates did not know how to break down Diego Simeone's resolute defence but is eager to move on from the defeat
The Blaugrana crashed out of the Champions League at the quarter-final stage after Koke's early goal gave Diego Simeone's side a 2-1 aggregate win.
Lionel Messi missed two clear-cut early chances and Neymar was thwarted by Thibaut Courtois, but Barca struggled throughout to break down a resolute home side, and Alba concedes they ran out of ideas.
"They were the better team in the opening minutes and after that we took control of the match, but we didn't know how to get into their area," he is quoted as saying by the club's official website.
"It's very difficult to beat a rival who play this way. It's hard to beat Atletico because of how they play. After 20 minutes, the intensity was the same for both teams.
"We have to forget about this game and start over. We don't like to lose these games, especially in a competition like this one."
Barca are still in the hunt to win the Primera Division and face Real Madrid in the Copa del Rey final next week and Alba is eager to seal a domestic double.
He added: "Now we have to win the Liga and the Copa del Rey."