Security staff were forced to remove Richard Dickson, 17, along with his friend, Liam Fergusson, who is the double of the boyband's Niall Horan.
The pair, from Glasgow, were mobbed by screaming girls who demanded pictures and autographs from the unassuming youngsters.
Richard and Liam were lifted from the crowd for their own safety and missed most of the set at Murrayfield, before leaving early flanked by burly security guards.
Apprentice electrician, Richard, who moonlights as Harry Styles in tribute act 'One and Only Direction' said: "It was the craziest thing that's ever happened to me in my life.
"When we got into Murrayfield we were completely surrounded, just photo after photo. People were running from the seated areas to the barriers. People were grabbing on to me. It got pretty bad. The next thing I know this big security guard came and got us."
Richard and Liam had to hide in an office with security staff but it wasn't long before screaming girls spotted them.
Richard, a former Bellahouston Academy pupil, said: "People started banging on the windows and trying the door. They had to pull the blinds. It was mad. We had to be escorted out the stadium. I was glad when it was all over."
One and Only Direction is the brainchild of former dancer turned tribute act manager Scott Garvie, who recruited all five teenagers from the Glasgow area.
He said: "I was apprehensive about the boys going to the concert because I kind of knew the crowd would want pictures. It just went crazy. I think there were about 1500 photographs taken with fans."
Richard's mother, Lisa Peebles, said her son is often stopped in the street by fans of Harry Styles.
She said: "It happens all the time. He's a lucky boy. I can understand why security staff were concerned."