Thanks guys! (or should I say girls)
I don't think there is any way to safely delay the onset of periods. It can be a hassle, especially at first, but as the previous poster says, one gets used to it and it becomes routine. Have your supplies (both pads and tampons) and know what to expect. You are right that it comes with the whole package of growth, which you *do* want and will love.
Take care.
I started my period when i was a 11 years old i was scared at first but got use to it. Ever girl is different no girl is the same trues me my mother was 9 years old when she got her period . If your worried go talk to your doctor about it