Breastfeeding failure

I feel I like a bad mother. I wanted to breastfeed so bad & I've been having latching issues & unable to get any help because I can't move much due to the stitches. I already felt bad enough taking meds while breastfeeding, but now she's not taking the breast at all & she must eat, so I had to give her enfamil. It's not the worst thing I know, but I know that breast milk is so much better for her. I'm thinking of purchasing a breast pump & maybe that'll help? I just don't like the feeling of failure. She's my first child, so I want to do this right. Any suggestions?