Exclusively Pumping?

I just want to say, I am still committed to making breastfeeding work, but it is very difficult. I have flat nipples, so I am using a nipple shield. Sometimes my baby will nurse like a champ, other times she won’t. We have been giving her a bottle of breast milk 1-2 times a day when she refuses to nurse. I just feel guilty because everyone acts like it’s wrong. I just want my baby to be fed and happy.

With that being said, what is so wrong with exclusively pumping? I get that it is difficult, but other than that? It feels so discouraged.