I tried eating well by myself and I think I am doing well but it is hard to stick to. My mum eats chocolate in front of me and so do my sisters.
I am confused on what to do.
The doctor won't judge you, he or she is there to help you. If you don't know your weight, you are just holding the reality back, and it will be harder to face when you get there. Step on a scale at home, and hopefully it won't be as bad when you get to the doctor's office.
Yes, diets are hard to stick to when you are used to eating badly your whole life. Just because others are eating something, doesn't mean you need to. Have some self control, and just don't eat it, eat something that you know is on your diet.
Hope this helped, Peter