Bleeding nipple

My nipples have been really sore and just gross looking. I've been pumping and giving my Breast milk to my little lady in a bottle cuz she doesn't seem to want to latch she's a tiny 6lb baby and my boobs are massive so I figure that's why or maybe just the feeling of them being yucky. Anyways every time I pump I swear my nipples are going to just blow out. I got done pumping my left boob and moved to my right and the 1st pull broke open my nipple and blood started coming out :-/ im so afraid of pumping from that boob now. I've been putting coco butter oil on my nipples cuz I don't have and nipple cream hoping that it helps. What's a good natural nipple cream?