I think others have given good advice here about your weight.
What I would like to say is I've seen how an eating disorder can affect a child. I nannied for a family with 2 kids, a boy aged 2 and a girl aged 4. When I began caring for them the daughter was already very picky about what she ate and would only have tiny portions. She would only eat
Egg fried bread
Bovril on toast
Jam sandwiches (white bread only with no crusts)
Cakes
Chocolate
Crisps
Fromage frais pots
Nutella
Processed chicken nuggets
Crap drinks like cola etc. Milk was still being given in a bottle with a teat at bedtime also.
Nothing else was eaten. Seriously, nothing else. It was sometimes a struggle to get her to even eat nuggets if they were too meaty and looked like real chicken inside. She really only like the disgusting processed ones
Fast forward a few years later - eating disorder in full grip, school concerned as her attention and energy levels were far behind the other children, teeth problems and also growth ones.
And the younger brother? He had eaten meals, spag bol, pasta, roasts etc plus normal day to day decent food but by then he also was very picky having picked it up from his sister.
Now who was the person in the house with the original eating disorder? Their mother. A tiny woman who starved herself to remain a size zero and who never ate meals with her kids and let them off the hook when they kicked off about what they were eating as she didn't have the energy to tough it out with them.
However the kids got used to seeing her shove an entire pack of Jaffa cakes down in one go then make herself ill or starve herself for 2 days afterwards. Or she would cry and make herself feel bad for having eaten such things. They thought that was normal. They had no idea that crisps, chocolate etc were not normal decent food for children.
Now when they go to friends houses for tea etc, they take their own food with them as they refuse to eat what is put in front of them otherwise. And its still crap food as they really won't eat decent stuff. Their mother is still stick thin and tbh has never really addressed the issues as she herself has not dealt with her eating disorder fully.
I cared for these children for 6 months and did all I could to try to improve their diet. I faced many meals where neither child ate anything I prepared and simply waited till I was going home and said to their mother they were hungry and she gave them cake
I am in touch with the family to this day. I've seen what happens when the parents who are the role models allow themselves to be taken over by something. It spoils the childrens lives also. And often once the damage is done in childhood, it can cause a lifetime of problems.
Another true strory...
My aunt spent her entire life on a diet. Her daughter was 2 years older than me and went on her first real diet at 11 as my aunt was constantly on about being thin etc. She then spent the next 20 odd years with an eating disorder. She is now obese and because of an argument over her size with her mother she ended up cuttting all ties with her and emigrating to New Zealand to escape her.
That's my bit of sharing for you
A child needs to be shown by their parent(s) what healthy eating is. You lead by example and they usually follow. They tend to like and eat what you eat. If you eat crap, chances are your child will lean this way also. If you obsess over your weight and clothes you can fit into, it can and probably will rub off onto your child. If you eat a well balanced diet and have a positive outlook on your body and clothing, your child will more likely be the same. Girls are under enormous pressure from a young age these days. Clothes, fashion, bosy shape and so on. We need to encourage them to be as balanced as possible to stop any insecurities or problems from taking over.