Welcome to the forum!
There are a lot of people here in the same boat as you so I am sure you will be able to find the support you are looking for.
The first thing you should do is listen to Evil Wombat Queen! As a relative newcomer here, I have always found her posts to be helpful and knowledgeable.
Food addiction is like any other addiction. It is bloody hard to beat. But, unfortunately, there is nothing you can do other than make the decision to do something about it! It sounds harsh but there are no magic pills, formulas or wands you can wave that will make this easy.
So you have to -
a. admit you have a problem (which is what you have done!!)
b. decide to stop making excuses and commit to doing something about it. This means being prepared change your habits (really try, not just say you will and not do it!). That's not to say you have to be "perfect". Maybe start off by making some small changes to start (for a fortnight or two) and get your mind/body in the habit of looking for healthier choices.
My own partner had a real problem with snacking - chips and choc - before and after dinner. What he did was look for better substitutes that, while not totally healthy, were better options. (eg. air popped popcorn, rice crackers with low fat hummous, rice cakes, skinny cow ice cream). We no longer have chips or chocolate in the house.
The harsh reality is you cant eat those foods you listed (maccas, kfc, pizza) other than as a "sometimes" treat...and by sometimes I am talking once a month or less! But the good news is, once you cut back on them you will find you wont crave them as much.
One other thing that REALLY helps me is reading the other posts in this forum, as well as using other weight loss sites to educate myself about what I need to do. But more than that, it inspires me to do better, to keep going.
Also, in order to get motivated, try making a list of all the reasons you need to lose weight. What benefits will come of it? What will happen if you dont.
Maybe try shocking yourself into making healthy choices. Keep a food diary of everything you eat (including calorific/nutritional value). You may be freaked out by how much fat, salt, carbs, cals you are eating. Try and project how much weight you will put on if you continue to eat this way. Use the calorieking.com.au website as tool to do this. It is very handy and easy to use.
Anyway, there are some random thoughts which I hope will be of some use to you. The good news is there is lots of good, credible information out there. Seek it out and make informed decisions based on what you learn.
Hope to see you on the forums as you tackle this head on