Why are the photos I took different from real people?

This can simply be called a weak lens feel. The way is to look in the mirror more often. If a professional photographer takes the photo for you, you can strengthen your communication with the photographer. As for looking in the mirror, when you look in the mirror, choose your best posture, and then when taking the photo, try to Hold the camera parallel to your eyes and recall your posture and expression when you look in the mirror. In fact, aesthetics change over a period of time. Maybe you will feel beautiful at that time in the future.