Why are my hips and butt getting bigger?

Lately my family has been telling me my hips and butt are getting bigger. They have also made suggestions why this is happening.. Some of they have been hint at I'm having sex which is a lie because I'm a virgin and some are saying I'm probably gaining weight and this can't be it because I have been excising and dieting... Could it possibly have something to do with my age? I'm 16 by the way and about to turn 17 (turn up!!😎😁) or is it something else?
Why are my hips and butt getting bigger?
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