Any tips how to loose weight

I am 12 and I’m 5’5 and over weight like a lot and my family pressures me to loose it I tell them I’m trying my mom and dad know it’s hard and I try so hard to make my body the way I’ve always wanted it but it’s really hard and I hate my body so much I started blocking my mirrors so I can’t see myself because it’s shameful and my family’s they type to talk about you behind your back then say It in front of your face I saw my great grandmother and great aunt and I had to mentally prepare so didn’t cry and tell them to shut up. I really need some tips because I’m tired of being fat