The result sees Inter dumped to the Europa League.
Perez said at the final whistle: "I am very happy and scoring in a mythical field is a dream. It was my debut and debuting and scoring is a great joy.
"It took us a bit to get into the game, but when we scored, we controlled the game."
Ansu Fati grabbed the winner and Perez added: "Both Ansu and I are the example of La Masia. Barça trust La Masia and this shows that if you work and believe, you can achieve."