Would you consider my jaw underdeveloped? (Photos)

I'd never really considered I had a weak jaw 'till I took a selfie with friends and saw that my jaw looked considerably smaller than theirs. I'm 19 years old and have always been a late bloomer (voice only started breaking after 16, growth spurt only happened after 17 etc) but I feel as if everything but my jaw is changing. If it is an underdeveloped jaw or any sort of abnormality, what would help?

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