Help with Pumping

Samantha
My baby is 5 days old now and I was able to
get her to latch for colostrum. But now my milk is coming in and my breasts are very engorged so I can't get her to latch any more. I have the Medela Harmany manual pump and when I pump my milk runs down my breast instead of into the pump. 
What am I doing wrong? I just want to feed my baby but I've had to supplement with formula the last few days. 
-one stressed new momma