Feel like a failure

I've been trying to exclusively pump for my 2 week old since we got home from the hospital. I know breast is best, but I have had a lot of baby blues since coming home. I'm overwhelmed and cry all of the time.  I'm pumping every two hours and am barely making enough milk for her next feed. My pumping and get eating schedule tend to get mixed up during the day so I feel like I'm always either attached to the pump or feeding her. I have a hard time getting anything done because of this. I know breast milk is best... But my mental health can't take this anymore. Am I a terrible mommy for giving up with breast milk? I simply can't do it anymore