Barnett's in her final year studying at Iona College in Hawke's Bay, where she's a member of the school's TeenAg club.
"I joined the club when I was in Year 8. Lucy Collin got me involved," she said.
Barnett has been an active member ever since, and last year was named best TeenAg club chair on the East Coast.
"It was such an honour to receive that award. But I couldn't have achieved it without the help of the entire club," she said.
Barnett chaired the club from 2017 to 2018. She credits a unique course run by NZ Young Farmers (NZYF) for helping to grow her leadership skills.
"The course was called Raising the Standards. It's run for TeenAg members. I really recommend it. I came back buzzing with ideas," she said.
"One of the best things about the course was meeting people from other TeenAg clubs."
Barnett cites former NZYF territory manager Isabelle Crawshaw as a major role model.
"Isabelle was such a big help and really inspiring. I'd had heaps of questions about running a TeenAg club and she always made plenty of time to answer them," she said.
Barnett is a role model in her own right. In June 2018 she attended the Hereford Australia National Youth Expo in Wodonga.