If you've been overweight for your whole life, it's sometimes harder to find the motivation to lose weight than if you were once slimmer. People who used to be slim but gained weight can usually remember what they once looked like, so they have a target to get back to. People who've always been overweight have no idea what they'd look like if they trimmed down, so it's more difficult for them to picture their goal.
As it's always better for you to be at a healthy weight anyway, it's always worth working to shed the pounds and find out what you're hiding. In the case of this woman, having been an overweight child who became an overweight adult, she had no idea she was hiding that incredible jawline under all the fat around her face. She's very glad she made the decision to eat more healthily - and it's only taken her two years to achieve her new appearance.