But the Ibrox youngster admits he loved the Old Firm atmosphere as his dreams of cup glory were dashed in the East End.
Billy Kirkwood's side lost out to their oldest rivals as Aidan Nesbitt netted the only goal of the game at Celtic Park to hand the Hoops colts the City of Glasgow Cup.
It was a deserved win for the young Hoops, who were the better side on the night against a Gers outfit who struggled to create enough chances until late on in the game.
But the outcome could have been different if Jamieson had luck on his side in the dying seconds.
As the Gers piled forward in search of an equaliser, it was the 15-year-old who came closest to giving the vocal Light Blue legions something to cheer as his shot from the edge of the area hit the bar and bounced clear.
Jamieson said: "I thought it was going in. Maybe I haven't hit it enough, or maybe hit it too well.
"We had other chances and maybe deserved a bit of luck. It is these small margins that count.
"It was tough on a big pitch and I have never experienced that atmosphere of so many fans. I will never forget that.
"I didn't expect a turnout like that. There were crackers and stuff going off. I have never experienced anything like that.
"I did have some nerves before kick-off, but when I got on to the park I was fine and I just got on with the football.
"Hopefully we can bring the cup back to Murray Park and win it next year.
"I am only 15 so hopefully I can get a winner's medal."