Hi day1, I suffered with anorexia and then bulimia in my teens, so quite some time ago now.
I'm now maturing nicely (shall we say) and my teens were a long time ago, but I can still remember how my mind worked in those days. And also how this horrible disease affected me.
Firstly the positive - you can come out the other side. It won't be an overnight thing and you may have relapses, but you can conquer it.
You're right when you say you want to change your thoughts about food. As those who have suffered know, it's not about being greedy, it's an addiction to the feelings that come with the whole scenario of binging and vomiting.
In very simplistic terms I think you need to start by telling yourself that you don't deserve to have bulimia any more. You are better than that. Why should you punish yourself anymore. You really do have to change your whole way of thinking.
What helps as well is realising how you are seriously damaging your body, and I do mean seriously. I'm assuming you do have children due to being on this site, so of course you want to be around to watch them grow up.
If today really is the day, then stock up your fridge and cupboards on good healthy foods, lots of fruit and veg, wholemeal bread, yoghurts, stuff like that so firstly you know you're not going to be depriving yourself and you're definitely not going to starve yourself.
Make a rule that you only ever eat when you are sitting down and prepare yourself some good meals. They don't have to be big, but bulk yourself up on the fruit and veg.
Try and be really strict for about 3-4 days and you will really soon start to get a good feel about yourself. You will see that it is possible to eat normally, feel satisfied and feel better. That leads onto not wanting to damage yourself by bingeing.
I could go on and on with tips. I'm a really healthy eater now, have been for over 12 years now) and am naturally slim and healthy after years of damaging my body, so it can be done but just take things a day at a time to begin with until your mind gets reeducated.
Hope this is of some help. Please feel free to CAT if you need some more support.