The fuller answer
The face changes through puberty as the jaw, nose, cheeks, brow, skin, hair, teeth, and body fat distribution develop. These features do not change at the same speed, so a face can feel unfamiliar for a while.
Human faces are naturally asymmetric. Phone cameras held close to the face can exaggerate the nose and distort proportions, while mirrored and unmirrored images can feel different simply because one is unfamiliar.
A sudden droop, weakness, swelling, severe pain, vision change, dental infection, or injury is different from gradual development. Persistent appearance distress can also deserve mental-health support even when anatomy is healthy.