12 days is the absolutely worst time.
My DH went back to work that day and I was crying saying "it's not fair, why is the MAN the one that gets to go back to work?"
:o
I completely identify with the relentless repetition and how you never have a break and you are suddenly not your own person who can do what you want, you are basically a slave to a tiny, sweet, fragile, precious bag of ENDLESS NEED.
The reason it's so hard right now is because you are on the steepest learning curve of your life.
"I find it so restrictive and so exhausting even though I feel like I am just sitting around the house. "
You are not just sitting around the house, you are watching your baby and learning how to be a mother. That's huge. It's just also emotionally difficult and also restrictive.
Here's what will happen soon - he will gradually get quicker at feeding, so gradually you'll start to be able to do little things that feel impossible at the moment.
Somewhere between 4 and 6 weeks he will start talking to you and smiling and laughing :o But even before that you will get to know him so well and his little quirks and personality.
Also, you will give in to the "Stockholm Syndrome" (as my friend whose DD is a week younger than mine and I used to call it) :o - you will start to love your captor and be accepting and even happy with your captivity. I know that sounds grim, but it's not :)
Tip: I know the snow is a PITA but do try to get outside every day, especially while you're feeling like this. Seeing the rest of the world going along as normal really helps, even if you do feel "pushed to the side of your own life" Afternoons - Philip Larkin
Less than a fortnight ago your son wasn't even born, you weren't a mother. I'm sure they feel like the longest 12 days of your life, but they are just days. This is the hardest part of the best thing you're ever going to do. But like all good things, there's a lot to learn and you've got all that to do right now.
My 2nd is 10 months old. When you have a second you get all the benefit of what you're doing now - having a newborn when you know what you're doing is a doddle. So don't let anyone tell you it's easy with one - it's hardest first time.
Hope that helps :)