Selena then recounted how she felt a "flip" happen around the age of 18.
"I didn't feel like it was about my art as much. I was on the fourth season of the show, and I felt like I was outgrowing it," she added.
"I wanted something different and obviously I fell in love for the first time. There was all this stuff that was happening and I didn't know what to do."
While she didn't refer to Wizards Of Waverly Place by name, the timeline matches that of the Disney classic, which began airing its final season in 2010, when Selena was 18 years old.
The singer also opted not to name her ex Justin Bieber, but the two dated from 2011 to 2014 in what was Selena's first high-profile romance.
At the beginning of her path to fame, Selena recounted, she approached her growing notoriety with enthusiasm-but things changed as she got older.
"When I was younger, it was all fun to me. When I did state fairs and 100 people would show up, I would be stoked. That was the best feeling in the world," she said.
"But when I got older, I started to become exposed to the truth behind some stuff and that's when it flipped a little bit. I realized that, 'Oh this is actually really hard, and kind of slimy in certain areas,' and I didn't realize that certain people wanted certain things from me. My confidence went through a lot with that."
Selena, who canceled her Revival tour last year to focus on her health and has since been open about attending therapy and taking care of her mental well-being, explained she went through phases of doubt as to whether she should continue on the same path.
"I would look at my crowd on tour and think, 'Yes, this is worth it, right?' But then I would look at myself in the mirror and I just felt like 'I've had enough, I don't know if I can go on anymore,'" she said. "And I stopped it for a second. But it didn't mean that I didn't love it, I just had to find what I was going to do with it. As long as I'm healthy and happy in my mind, I'm all about it."