Camarda, 16, was a second-half substitute in the 3-1 win against Club Brugge. He becomes the youngest player to feature in the the competition for Milan.
He later told Sky Italia: "The record title gives me a lot of pride, but it also pushes me to give more and improve myself to make these nights happen more often."
Then the disappointment of the disallowed goal: "I think it was the best feeling of my life, then the VAR played a trick on me. I'm very disappointed, but these things happen, especially in today's football."
Asked if it was the biggest disappointment of his career, Camarda admitted: "Absolutely, I can't find the words."
He continued: "These are the nights you dream about since you were a child. Give life, then for Milan future and Youth League I take and give my best.
"You always dream of a night like that: it really happened and what happens, happens."