Hi there!
I can relate to what you are feeling. There was a time when I could sleep for 20 hours a day, if nobody bothered me. All I did was sleep, eat, and watch TV. It didn't feel like living at all. It's hard to deal with, and even harder to break the habit. I'm 21 myself, and still struggle sometimes.
What I did first was I worked out my sleeping schedule. I got that fixed, then I worked on food, then I worked on exercise. Doing it all at once just seemed so overwhelming. Some people actually opt for therapy to find out why they use food as such a crutch, and to deal with it. If you don't feel as though you actually need it, then that's fine too.
I've heard that it takes a full 3 months to kick an addiction, which is why when I got rid of things, I got rid of them for the long haul. That isn't to say I can't have a poptart on a rare and random occasion EVER again, but I can't eat them on the weekends or anything, it will mess me up big time. Protein is a big one for keeping me full and keeping me from snacking, and carbs, too. When I am really low on carbs I get irritable and snappy and sometimes even dizzy or feel ill. Also I find that now, after about 6 months of eating better and exercising, I don't really CRAVE chocolates or sweets as much as I used to, and some things I used to love don't even taste as great as they used to.
Another thing is I count my weight loss goals in lbs of 5, it's just easier for me to look at things like that. So instead of thinking, "oh gosh I have 28.4lbs to lose, an then who knows what" I'm thinking "oh wow, only 4 more lb until 165, excellent!" I think 40lb by Jan 15 is really going to put you in a bad spot, it just doesn't seem realistic. I agree with pipernoswiper. If you attempt that you might burn out in the middle and go back to your old ways of eating, thinking 'i'm doing everything I can and not seeing the results I want, so what's the point?' etc. I would shoot for 20 by january 15th, but have expectations of somewhere around 10.
That's just me though, and you can do whatever you want and are comfortable with.
I'm not sure how you should go about starting, maybe start smaller like weening yourself off soda if you drink that, or onto diet at least, or replacing 1 junk food snack with fruit or veggies, then go on from there. I doubt my post is much help but maybe someone else can point you in the right direction, but whatever you do don't give up
