I'm 20 years old and I have big nipples. I am wondering what it is considering I am in shape (Photo)

From your photo, your anatomy looks well within the range of normal.  Nipples and the surrounding areolae come in all sorts of sizes and shapes, and many of them are completely normal (and functional).If you're still concerned, it might be helpful to schedule an appointment with a board-certified plastic surgeon, who will be able to examine you and address your concerns in person.Hope this helps, and best of luck.Dr. Lim

There does not appear to be anything abnormal about the size of the areolae but an examination by a board certified plastic surgeon will verify this for you.