I’m so proud of myself but at the same time terrified!

My first child would never latch so I pumped for a month and then gave up because I was 17 and exhausted. Now I’ve had my second child and I actually got him to latch and breastfeed!! I’m so proud of myself but now I’m terrified that he’s either not getting enough or I’m not producing enough. He’s 3 days old and all he wants to do is eat and if he’s not eating he’s almost always crying. Is this normal?