OP, I understand exactly how you feel (I think!).
I felt just the same. When I was diagnosed with PND, I honestly didn't believe that I had it. And 9 years later, I still don't think I had it. Basically, I just didn't much like being a SAHM full time and found it really, really difficult. I also felt a total loss of my freedom and sense of self- that was depressing.
I was really, really desperate to become a mum. I'd had 2 miscarriages and then had years of failure conceiving. I wanted a baby/child more than anything in the world. So when my DD arrived and everything was NOT like the dream come true that I'd pictured, literally dreamed of, for YEARS, I was absolutely amazed and SO disappointed.
But there we are! I wish I'd felt different, but try as I did (and I tried to enjoy it all SO HARD), I just really didn't like it. I coped by learning to accept that I will always struggle if I can't have some time to myself regularly, and that being a SAHM is not for me. When I got over the guilt, which was the hardest thing, and took years, things were better.
I put my DD in nursery before she was a year old, 2 days a week. I wouldn't have coped otherwise- I needed time off from her. Could you do something like this?
Also, I found baby groups and stuff helpful to a point- but still didn't really enjoy them. I did them to have something to do, but can't say I enjoyed the whole 'baby' scene! And, that was OK.
I must add- I love my DD very, very much. And I've found as she's got older, I've enjoyed being with her and being a mum more. It WILL get easier for you. You are NORMAL. You're doing well. Try and accept that. Try and NOT feel guilty about utilising the nursery. I found that using nursery saved me (in a way- I was desperate for time away from DD, I felt so guilty too, but it really helped).
I also had a traumatic birth, neonatal unit and then couldn't breastfeed. I understand that all contributes to how you're feeling. It's good that you're acknowledging that this is all part of the feelings you're having.
Hang in there- it gets easier. And don't worry- you are normal. Good luck x 