A slew of teenage girls have been left traumatised after discovering the man they thought was a handsome, 20-something university student was a 46-year-old builder and father-of-two, according to Channel Nine's Inside Story.

Dalby man Stephen John Grott stole the identity of a Queensland physiotherapy student named Jayke Williams and struck up relationships with at least 20 underage girls and young women online, Inside Story reported on Thursday night.

He was sentenced to three years in prison for stalking Queensland netball player Romelda Aiken and teenager Ellisha Johnston, after menacing and threatening his victims using Williams' persona. 

Ellisha Johnson says when Grott befriended her as a 15-year-old, she thought she had fallen in love. Photo: Inside Story

Ms Johnston was 15 years old when Grott befriended her on Facebook using Williams' name and photographs and thought she had fallen in love.

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"I hadn't really had that attention from guys before … he definitely made me feel good about myself," Ms Johnston said. She was in year 10 at Dalby State High in Queensland when Grott first made contact.

Ms Johnston said she only had the courage to go to the police after four years of harassment when netball player Aiken spoke publicly about being duped by Grott.

Stephen John Grott was sentenced to three years in jail for stalking. Photo: Inside Story

Grott eventually convinced Ms Johnstone to send him photos of a sexual nature.

"I feel so stupid now for it ... he made me fall in love with him and that's why I believed him for so long," she told Inside Story.

When Ms Johnston began dating someone else, Grott posed as the teenager online and sent crude emails to her school principal. A USB containing naked photos of Ms Johnston were sent to her uncle.

Police interview Stephen John Grott. Photo: Inside Story

Grott told police he didn't mean to take advantage of anyone when he posed as Williams online.

"The whole intent of it all was just to see what the people of Dalby were doing and whether they were giving my daughters a hard time or not," he said in a police interview aired by Inside Story.

"I just thought he was a decent-looking bloke and the friends would accept him as being a sort of rough and tough sorta blokey bloke and the guys would allow him to be friends," he said.

Jayke Williams had his identity stolen and used to woo girls. Photo: Inside Story

Grott will be eligible for parole in January 2016.