Step mom bullies me

So I’m 14 and since I’ve begun puberty my weight had been all over 5th grade I was overweight 6th grade I was “normal” (lost weight) and 8th grade I got large (160 pounds) my step mom always calls me fat and it bothers me. My dad doesn’t say anything about it either. See always says “you way more than me” and it really messes with my confidence to the point where I wear large clothes to hide my weight and hoodies in the summer. Any advice? I am trying to become healthier.