your body is entirely normal, i'm heavier at the same height and get the same comments from family since i'm from a country that's pretty renowned for their obsession with being skinny. they hate that i lift weights lol and always compare me to a man. you're right, you're growing into your adult body and as we grow we change. i hope you have chosen family who uplift you and don't tear you down over your body, there's nothing wrong with it and you're growing into yourself. it's okay to change