I dont love my baby

Hello, I hope you can help me. I have just become a father for the first time and feel I am loosing the plot. I am 39 years old and been married for 5 years. I never ever wanted children and my wife knew this. However I agreed to have a child because she was so desperate for a family.
I convinced myself everything would be OK and I felt that as soon as I saw my child I would love it so much I would kick myself for not giving in earlier.
The problem was the first time I saw her all I felt was resentment. I have tried to bond with her over the last 6 weeks but I feel nothing. In fact as soon as she cries its like someone flicks a switch inside me and I feel real anger towards her.
I know I would never hurt her and I do know I want to protect and provide but this hurts me to say this but I don't love her.
Its now becoming a problem with my wife. She adores the baby and I know she is torn between the two of us. We had such a wonderful life together before, now its all changed.
It scares me to think that my wife will start to loose respect for me if I can't be a good father but I don't see a way out.
I can't go through life pretending to be happy and I can't stop the anger from showing. I have never ran away from responsibility in my life and I won't run away from this but at the moment I don't see a way to be happy again.
All I want it to love my daughter the way others do and feel a bond but all I feel is total dissapointment in myself for not feeling anything.