I feel like a failure

I had my baby girl 4 days ago. breastfeeding has been terrible. Come to find out I had mastitis (thought it was just hormones due to pregnancy) in one breast and clogged on the other. I still have tried to breastfeed and I’m miserable. I’ve cried so much today bc it hurts but we had to give in and give her formula today bc my doc was considered she wasn’t having enough due to lack of wet/dirty diapers. I cried bc I felt like she didn’t care for it and she just wanted me. I just want this to work out so bad and my husband is trying to make me feel better and tell me she won’t know the difference, but I will. I just wanted to successfully breastfeed for my 3 months off while I was on maternity leave and now I can’t help but think of the cost, health benefits she’ll be missing out on, and the bonding I won’t have. I feel like my body is failing me and like im being a wimp for not dealing with the pain but then I breastfeed and I’m literally in tears. I just want to do what’s best for my baby and I feel like I’m failing her.