The 28-year-old Toffees star was pitched in against the likes of David Villa and Fernando Torres but after a hugely impressive 35 minutes, lost the ball to Xabi Alonso and was then skinned by Villa for Spain's opener.
Jagielka was one of five men who did not last beyond half-time in the 2-0 defeat in Seville and was heartbroken by his mistake.
But now he looks back on that as a crucial part of his football development.
He admitted: "That turned me from a boy to a man in a way. It was a strange game, really.
"If you look back at the 45 minutes, five were bad and 40 were really good.
"I was happy with my performance but the main talking point was obviously my bad decision with the pass and then not getting back to tackle.
"Unfortunately, that's international football - if you make a mistake it's blown up and I didn't feel good after the game.
"But I would agree that it helped me to deal with the expectation of playing for your country and it took me on to the next level."