The lead singer of Florence and the Machine explained that she finds it easier to express herself through her music.
Welch told Nylon: "I would find songs and they would totally save me. It was just me alone, in my bedroom, dancing by myself, wearing weird clothes. Now I do it on stage, but I had a lot of practice."
Welch admitted that she finds it difficult to discuss her emotions.
"It's funny because I'm not actually very good at saying how I feel in person," she commented. "I think songwriting is a way for me to deal with my own emotional failings in life.
"When I'm making a song, it's almost as if I can express how I feel. It's almost as if, to get a message across to one person, you have to sing it to a couple of thousand!"
Welch also said that being on stage allows her to be whoever she wants to be.
"When you're singing you can escape yourself, and lose yourself in the music. I can at least pretend to be graceful, then I come off stage, fall over, and scuff my knees," she added.
Welch recently announced that the band's new album will contain songs about "imaginary things", such as "ghosts and rumours".
Watch Florence and the Machine's music video for 'You've Got the Love' below: