Breast and bottle

My little girl has had both breast and formula sometimes she latches in great other times not so great ... she is so much more settled after a bottle even a bottle of breast milk ... I’m struggling with the decision not to breast feed and just pump and use formula has anyone else done this? I’m feeling guilty about my decision but is it just because I’m in the baby blues stage!? I have a 3 1/2 year old who didn’t latch on when she was born and had breast milk pumped and formula