Most Helpful Girl
You should hold the camera slightly above your head... not below your head. It's probably the angles that is the issue and likely not you. Best pictures are taken by others too. Selfies can maker your appearance look somewhat distorted and makes everything appear bigger than it really is. Ask someone to snap a few pics of you. Or get a tripod :)
Most Helpful Guy
Nothing wrong with you. Keep shooting from all angles and lighting.