I am a 16 year old female with stabbing pains in my left breast and nipple, i have rather large breasts too, very concerned ?

See your doctor.: Breast tenderness is quite common during adolescence. For many teens, breast tenderness decreases as you complete puberty. However, you describe your pain as stabbing, which sounds a bit more serious. See your pediatrician or gynecologist just to be safe.

Time to see MD: The United Kingdom has a socialized health care system so you should be able to get into the "queue" and see a MD and get examined for this problem without cost.