It takes A LOT longrr if you're a bigger person, so give yourself time and make lifestyle changes, not a diet or resolution. It won't be days or even weeks, it will take months. Be proud of you and do it for yourself! That's the only way you'll be successful!!!
My Great-great-great grandmother ended her days as an inmate of Windsor workhouse. Born in the early 1800's she ran a pub until she was well into her eighties. But when you were too old to work and support yourself and your family couldn't support you, this was your only option.