I wouldn't worry about it too much. You are still within the normal age range of getting your period, and you seem like you're at a fairly healthy weight. Did the rest of your development happen late (e.g., did you get breasts and pubic hair later than most of your friends?)? If so, you're probably just a "late bloomer." I assume you have an annual physical exam (I know I did in high school, because my school required it), and the doctor probably asks you whether you have gotten your period yet. If you are in good health and your doctor is not concerned about it, you don't need to be either. However, if you are concerned about it for any reason, it certainly wouldn't hurt to see a doctor sooner, if only for your piece of mind (also, since this is something that you want to know, make sure you ask the doctor about it when you go in for your physical).
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