same here- only first signs in 6th grade. don't know if I should be concerned
(Not that it's unusual to be 14 and not have things start up yet, but the time gap you mention from them starting up to now is a bit long.) Also, have you lost weight in this time? Many women don't get their period if they are underweight.
It's been five years since you began to show signs, and everything is stalled? Ask your mom to schedule you with an ob/gyn and get some hormone tests and maybe an ultrasound. Have you had any pain in the lower abdomen?