Distortion through a smartphone lens is down to focal length. The human eye sees approximately with the equivalent of a focal length of about 50mm (this is just a rule of thumb as human vision is variable and doesn’t work like a lense-sensor-setup). Standard smartphone cameras usually have a shorter focal length which leads to more distortion. Your front camera might have a fl closer to 50, but here I’m just guessing.
There’s also the issue of your face being mirrored, ie flipped, in a mirror and your Selfie cam. This is not actually distortion, though.
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