The 26-year-old is currently promoting her new album Goodbye Lullaby, which has some emotional tracks that could leave fans guessing about their meaning.
She said to MTV News: 'At this point, because I've been doing this for 10 years, I've kind of learned... my life lesson has been about not worrying about people and what they think.
'Obviously I care. I want people to like my music and stuff. I've had to learn to really focus on myself: who I am, what I want... You don't want to have distractions, especially when you're being creative.'