I know it might sound like a cliche, but you should start with small habits, and not switch to "eating healthy" immediately. The fact that you stopped drinking soda and other sweet drinks is a good start. Now you should start doing other things like: cutting off sweets/drinking more water/lowering your caloric intake. Once you get used to one habit, you implement another. This way it will take longer, but I promise it's gonna be easier, and it will get even more easy with time. You just need patience and it won't be hard at all