What you need to know is that this can all be ok. Eleven days is nothing. It can be three months to establish breastfeeding to the point of confidence, and then you change how you do it every few weeks according to how the baby develops and what s/he needs.
Give your baby formula, top ups, whatever you need to keep him well. Don't panic. I was a shit hot breastfeeder (eventually) and my little one had soya top ups from four to eight weeks. My dd grew up to be a champion breastfeeder herself, and her baby had top ups whenever it was best for the family.
There's a whole load of not worrying needs to come down on you.
So, put away your breast pumps. Ban any other non-natural device like nipple shields. Put aside any 'routine' or 'training' plans you might have had.
Give some formula. Get a sleep in here and there when you can. Have a shower. Then put the baby back to the breast. You know he can latch on, so that's ok. You're aiming for 24/7 at the breast and you'll get there before three months. The suckling prompts the supply, that's why it matters. No dummy/pacifier.
Expose your nipples to the air when you can, to keep them healthy. Eat well, don't get dehydrated. Allow your baby unlimited access to the breast. Don't think of bfg as food, think of it as what the baby does, awake, asleep or in-between.
Find a way to express by hand - it's fun. It doesn't work until you're relaxed so don't worry if you're only getting a drop or two. When it happens, when you get the hang of it, you'll be able to shoot breastmilk 12-20 feet across the room. If you're as daft as me and think that's funny...
So, in brief:
Don't worry
Get some sleep, food, drink
Top up as necessary
Offer breast constantly
If the baby sleeps off-breast, hand express for a laugh at first, and to save and feed when you get the hang of it.
Hang in there. Good things are coming your way.