Wikipedia Training Bra Help! Im Worried!?

Help! im worried!? - wikipedia training bra

IM 15 and I am completely flat chest, I do not think to wear a bra, including training, havent got my period. but my pubic hair. in body size and weight, if not the lack of fat, as well as healthy and as I read something, and I'm worried, "If some aspects of physical development is delayed and not others, there is probably something wrong, for example., most girls, goes the early stages of development of breasts pubic hair. When a young girl of 12 years at this stage of pubic hair Tanner 3 for a year or more to achieve, without a development of the breast, it is unusual that an abnormality such as defective ovaries show. "
This is the website (please read and help me)
http://en.wikipedia.org/wiki/Delayed_pub ...