13 week old baby here, EBF, emergency c- section. My milk actually came in on day 2, reached birth weight by 9 days, no formula top ups/ pumping. He's now a stone. I'm telling you that because clearly I have enough milk.
Babies are always hungry! One of the big reasons people stop breastfeeding. It's knackering, and you constantly question yourself. I used an app to record and one day I breastfed him 22 times! No day was less than 16. Sometimes he fed for 5-10 mins, some days he fussed on my boob for over an hour. It's cluster feeding and normal and just had to ride it out. Growth spurts are hard. He goes back to feeding every 45 mins day or night. First time he did that at 5 weeks I questioned my milk supply out of anxiety, yet in the same week I had to move him up to 3-6 month clothes! He was and still is on 91st centile. Still a very hungry baby.
If you want to solely breastfeed it's a battle to establish. Get in touch with a local charity, get some help with latch, advice etc. Then bunker down for lots of skin to skin, constant constant feeding, constant supply of food and water. It's a lot, you won't get much sleep.
You can decide you're happy mixed feeding and take off the guilt. He is fed, he's fine and happy. If it's making you miserable sack off the breastfeeding! You've gotten through 2 weeks. He's had colostrum, some milk. You've given him am awesome start and going into this amazing time of them growing and learning new skills your baby will be better off with a happy mum that enjoys and engages with him than a miserable one stressing about next feed and pumping.