Sometimes it's hard to get going, the fear of the unknown, and the fear of change stops us in our tracks. You need to write down all the reasons for doing this, for losing weight and getting healthy. Keep this list pinned on the fridge or food cupboard and when you find yourself reaching for something unhealthy, read over your list again.
You have to be the strong one and the one to motivate yourself. We can offer all the support in the world, but at the end of the day, it's your choice to do it, or not do it.
Visualise yourself, slim and happy, picture the clothes you'll wear, the compliments you'll receive, and the way you'll feel. It will all come together for you when you're ready.
Good luck x