How do fat people exist?everytime I look at a fat person I'm so confused. Like...

In my case I gained weight as a result of being put on antipsychotics. Pretty much impossible to avoid, and I was at least never obese.
However, now that I'm fully adjusted to the medication I'm losing weight no problem, feels fantastic.

How big was the sub?

The part of their brain that tells them how much to eat is damaged, user. Often they try diets but give up because they feel hungry all the time.

I didn't eat a sub yesterday

Not sure abot the first part, but one challenge of dieting is indeed always feeling hungry (and thus grumpy/irritable) nearly all the time until your stomach adjusts

I am overweight. Eating allows me to feel things other than the usual grey of life. Eating fills the emptiness for a few minutes. It makes me feel physically content and thus happy on a very base level. Warm and comfortable. I know it's not the right way to go, but the only other way I know is other drugs.
Cooking is one of few things I really have to do in life (food is essential for the continuation of my existence) and which at the same time allows me to get my mind off other things. It can be as simple as following a recipe or as complex as analyzing all the previous times I've cooked a meal and attempting to find a flaw and improve upon it. It is a great distraction, as is any hobby. It's easy to do, but hard to master.
Don't even get me started on bulimia.
In short; I use eating as a coping mechanism for depression.

Yeah and what you don't say is that half of your 2 liter of "diet soda" was ranch dressing

Holy shit this is cope. Keep telling yourself that you're fat as shit because of how hard you have it and not because you're too stupid and lazy to fix it.

I don't have any ranch dressing and I said a glass not 2 liters. soda gives me heartburn so I tend to avoid it

Fat people always try to down play how much they eat