The singer said she felt that she had to pretend while she was a popstar, but that she was more than happy to be back playing in No Doubt.
Speaking to New York Magazine, she said: "That whole period when I got to do [solo] records, to me it was indulging my theatrical side, songs that were never really meant to be taken seriously, just for fun."
"It was just a project I did that was very inspired, and it kind of got a little out of control, really," Stefani added. "But there's no place like home, we're so comfortable together, we understand each other.
"It feels, like, normal. Whereas that [solo] period felt like I was trying to be something, and play a role, and pretend."
During a recent No Doubt television performance, an 'exhausted' Stefani forgot the words to some of the band's older hits and had to ask the audience for help.
No Doubt are set to release sixth LP 'Push And Shove' - their first album in more than a decade - on 24 September in the UK.
Recent single 'Settle Down' is included on the album and has been remixed by Major Lazer. Take a listen to that below: