NEW YORK — Miley Cyrus said when she stole the night at last year's MTV Video Music Awards, she didn't realize her impact and influence. The 21-year-old is assisting the Hollywood homeless center My Friend's Place by launching a Prizeo campaign, urging her feverish fans to donate to the cause assisting homeless youth. “I think what I realized after my last performance at the VMAs, I didn't realize my platform, I didn't realize my power and I didn't realize my voice and how loud it is,” Cyrus said in an interview Monday. “And I thought, you know, rather than sit here and talk about, ‘Oh, on every news cover, every time you go to AOL or wherever you go everybody's sitting there talking about me,' instead of using it as a negative, how can I use it as a positive? If I'm going to be speaking this loud, what am I trying to scream at the world? And this is it. It's kind of a wake-up (call), which is what I had to do.” Cyrus said the high of winning awards and memorable performances doesn't last long, unlike her charity work. — AP