Drew told Fox All Access: "I wish I would have done something upbeat. I believe I could have won if I'd really showed how versatile I could be. That was a mistake made not only by Simon [Cowell] - I know he took the blame - but also by me. I should have fought and fought and fought for what I wanted to do.
"It's a learning lesson for me and life is only going to get better. I'm 14, almost 15 - I can't wait for my birthday! - and everything is going to get better."
As for what she will take away from the show, she said: "In the beginning Simon told me to be myself. I possibly drifted a little bit from that. That's the advice I'm going to take when I go back to Arizona.
"I need to keep going as Drew and stay strong as that. I know that now and I know I can do that."
She added: "I'm looking forward to my future and doing something upbeat, possibly dancing. I'm looking forward to the excitement of singing and I can't wait to be there."