It's really normal to feel like this. I did for ages with my DS, I didn't enjoy the baby stage at all! Of course I love my son but gosh, the first few months I just felt like I was on autopilot. I didn't even feel like I 'liked' him, let alone love him in the first 4 wks. Everything started to change when he was 5wks old and smiled for the first time. My heart melted a little seeing him smiling at me and my feelings grew from there. It still took me a couple of months before I could honestly say I loved him.
I think a lot of mum's feel this way but it's not really talked about all that much. It really helped me to talk to my friends about it, once I did I discovered that I certainly wasn't alone.
Are you going to a mother's group? I found that to be a great support too. No one really talked about their feelings in the first couple of meetings until I blurted out that I wasn't enjoying it (I never had PND thank goodness, just wasn't loving it), then about half the group started saying they were feeling the same way too. For me the first 6 months were really challenging, not the whole time but they were the months where things were very up and down. After that I've LOVED every stage.
I think having a baby is the only time in our entire lives when we're expected to love something we don't know, who's extremely demanding and gives us nothing in return. It sounds harsh but I just don't think we're all wired that way. When you start getting feedback from your bub (gooing, giggles and big smiles), it makes all the things you do for them so much easier.
Hang in there and try not to dwell on it, it will get easier and a lot more fun!