Sleep. First, most babies dont' sleep through the night for a long while, and that's really hard. Second, even if/when they do sleep through the night, it is a different kind of sleep - not as deep. And then, they wake up earlier than you want. There's this constant fog of tiredness.
Going out. Eating out is more trouble than it's worth a lot of the time. We dont' eat out often anymore. Going out to movies - you dont' do it at all for ages and then when you can go to movies again it's to kids' movies. And if you like watching movies at home, that's hard to navigate too because you can't just put on any old movie when there are little eyes around to watch. Even when they're at an age where you can get a babysitter, that adds so much to the cost that it doesn't seem worth it. If you have grandparents close by, this will be easier.
Vacations are not vacations in the same way. You're still doing everything you usually do, just somewhere else. I remember telling dh this on vacation once. He said, "Hey, relax, we're on vacation." And I said, "No, YOU are on vacation, I'm just here and it's harder for me because things aren't toddler proofed here."
Just jumping up and going someplace. Nope, not gonna happen. It's a logistical issue and it takes a while to get things together. Going grocery shopping isnt' easy, but then it can be a joy if you can leave the babe with your dh and quick do some shopping. But then thats' all over once they hit the separation anxiety age, but on the other hand things aren't so overwhelming at that point and it's not so bad to take them along.
Just logistics around the house are difficult. Getting cleaning done, making dinner. Just have your dh make dinner or get take-out for a while, if you can afford it. You need your time to adjust to taking care of the baby and breastfeeding.
I had a very hard time adjusting to my first, and I ended up with PPD. My recommendation is to find a support group for new moms. They're out there. Look into it at your local hospital, even if you homebirth they might have a decent group. LLL is great too. But no matter how much work it is, get out of the house with some other moms of babies.
It is very hard at first, but it DOES get better.
