I could have written your post at 6 weeks, and all the way through till about 3-4 months. In fact I'm pretty sure I did post about very similar things.
It really was the most horrid time, and made worse by everybody going on about what a wonderful time it's meant to be. The thing is, we're all different. DD is now nearly 7 months old and I love spending time with her. I came back to work at 6 months and it's the best thing I could have done. I really enjoyed my last month or so of mat leave (I think seeing the light at the end of the tunnel helped!), and now feel like I've acheived something in that I 'made it'. Everybody tells me how lovely and smiley and settled and content she is, so I feel like I did a good job, and tearing my hair out at 6 weeks like you, didn't really matter in the long run. I positively race home to see her and we try and make an effort to do meaningful things as a family at the weekend. Life is pretty good.
It will get better for you. We're not all designed to revel in the newborn stage (as lots of mners told me when I was on here wailing about the same thing), and look at it this way, it's kinda nice knowing that things are going to get better, much better, and probably quite quickly. Better that way than loving newborns and thinking it's all downhill from there!
I had days (and weeks) where I felt like she just didn't like me either, like I couldn't solve any of her problems, like I couldn't comfort her and just wound her up. And other times where I just felt like there was nothing wrong with her, she was just a misery guts. None of that is true, babies are just hard, and at 6 weeks they're still getting used to life on the outside. As per Prima I was definitely still in the hit by a train stage at 6 weeks. I think some friends had said the first 6 weeks were the worst, which was unhelpful for me as I was holding onto it getting better then, but of course it doesn't happen overnight. I think for me 3 months was the more useful milestone, but it might be different for you.
Caveat to the next bit: I gave up bfing as DD was losing lots of weight fast, and am not a co-sleeping, sling-wearing type of Mum (not criticising, we're all different), but someone on here said that the first 3 months is often referred to as the 4th trimester - where baby barely knows it's out. When I read it I thought it was hippy-dippy nonsense, but now DD is a bit older, I can kind of see it, as it wasn't until 3 months-ish that she really became, in my eyes, a person in her own right. She started to interact a bit, and I started to understand her needs much better. Before that, it was a case of trying to replicate conditions in the womb (feed on demand, swaddle, etc), whereas after that, she became able to stand on her own two feet a bit more (not literally obviously, that would be surprising!).
Hang on in there, it's crap, people don't tell you that, they tell you you'll be tired, and you are, but it's not just that. It will get better, promise.
D