Hey Lissi, welcome to the forum,
I agree with Rochelle, set yourself mini goals to help you stay motivated. If you are terrified of dieting perhaps go and see a dietician so you can learn the right way to eat, you know everything in moderation, no food is evil. They should teach you how to eat right so you can make it a lifestyle change as opposed to a diet where you go on and come off. You know, something that you can continue to keep the weight off when you reach 55kgs.
Good luck in your weightloss journey, we are all here for you,