Barcelona coach Xavi admits his players frustrated him during their Supercopa de Espana semifinal win against Real Betis.
Barca won on penalties after the match had finished at 2-2.
Xavi said, "We have gone through different phases. The first half was totally ours. The same thing happened to us against Espanyol, Atlético and Intercity, that we didn't score the second goal that would have changed the game.
"In the second half it has changed. Betis has dominated in some phases, they tied us, Ansu scored a great goal and we dominated again and Loren tied us with a great goal. In the end Ter Stegen made the difference. It's a desired final. It was the first goal and now we want to win it. We suffered against a great rival. We haven't been able to defend as well as in the Metropolitano. The game has been long for us.
"We need to mature the games. We scored the second goal and we missed scoring the third. It's been happening to us since the World Cup break.
"We don't know why we're down. We've talked about it and seen it on video. We have very young people in the squad and perhaps it's affecting us too much. We've competed and we're in the final."
Barcelona will now meet Real Madrid in the final in Riyadh.
