Man reminds me of when I used to skip breakfast
Dude just eat something man, a low fat yoghurt and an apple or something, or better yet some bran.
Replace your coffee with something like mineral water or warm water with some squeezed lemon juice...
Kill the pizza. Dead.
White rice? Burn it. Brown only.
Sit ups will do nothing except exercise and strengthen a part of your core. Also work your lower back to remain balanced.
Want to see your abs your going to need to drop the body fat percentage.
Tiredness is most probably related to your diet. Coffee might perk you up for a minute, but the longer lasting effect of dehydration will do wonders to make you feel less than great. Get some fibre and carbs into you. Keep you 'fuller' longer, and you have an energy supply to use.
Running on the treadmill is the light at the end of the tunnel. Do it, enjoy it.
Better yet, play something with friends like football or basketball. More enjoyable.
I empathise so much with your post. One year ago that could have been my post.
Oh and most of all, keep the faith. If you want it to come off and can be patient...it will.