There's really nothing you can do - just allow your body to take its own sweet time.
Messing with your body's clock by trying to encourage your period on faster is actually more dangerous than it sounds!
Making your period come on faster
Anything that throws your hormones off could have devastating effects. You might delay the onset of puberty, not develop properly, and open yourself up to all sorts of problems.
Growing up and becoming a women will happen eventually, and when it does, you'll see that you didn't actually have to wait all that long in the grand scheme of things!
Periods coming faster? Just don't bother - is what I say :)
