It can also be genetic. Some people with larger eye sockets than eyes have bags. It runs in my family and begins to show up in teenage/20's. Unfortunately you may never become a movie idol or a high priced catwalk modle becasue of this. I'd say see if any relitive has baggy eyes.
Are you eating more sugary foods and simple carbohydrates? That could cause inflamation that is reflected in the face in a number of ways, including blotchy color, bags under the eyes, early wrinkles, general pallour.