My first born slept like a rock the 3 days we were at the hospital. I said out loud, "he sleeps just like me, maybe he will sleep through the night right away".
Complete fucking opposite. Fed every hour, my wife's nipples were raw.
That first night when he wouldn't stop crying (after we got him home), we tried everything & I looked at my wife "and said maybe there's something wrong with him". I shit you not.
It's overwhelming, it's emotional but it's a blast. I never really felt like I had to be a dad until I was actually one. It's like the 1st time you hear or see them it flips a switch. My son crying at birth was the most emotional moment of my life (sorry to my daughter and everyone born after her lol).
You're going to over react that's normal. That's part of caring for someone more than you care for yourself. Just enjoy it & try and keep calm. For us, every day is just moments in our lives. At this point, a day or event is miniscule compared to the bigger picture. For them, a moment or day is such a huge part of their life. Do everything you can to enjoy them but at the same time don't kill yourself. Take breaks, step back & take a breath.