OP
It's normal to feel completely overwhelmed and like you're lost. I cried for a month after giving birth! But it will get better.
If it helps reassure you, after I had my much wanted and long planned for DD, I had difficulty establishing breastfeeding and felt like such a failure. I now know I was I shock after she was born, but I didn't get that 'rush of love' when she was first born that everyone talks about, and I had a moment where I was trying to feed her and I sat there and genuinely thought, 'we made a mistake', and I cried and cried and cried.
And that was really scary.
I thought I'd be overcome with love and happiness, not feel empty, scared and in pain. For me, it was just a bad case of the baby blues and all women get them in varying forms; I started feeling less teary and more myself about a month after.
The important thing here OP, is that you talk to your midwife and health visitors, they're there to support you. Your partner needs to google 'baby blues', make you a cup of tea, give you a cuddle, and quite frankly shut the hell up. Whatever you're feeling, feel it, don't try to suppress it, and gradually things will get better.