Breasts hurt

D • Mama of 2,lost an angel, waiting on number 4💘💓💘 married-blessed💓
My nipples are like very sore by now, I'm breastfeeding and really wanna continue it but my boobs just really hurt, I cant breastfeed her properly without hissing in pain for like the first 10 minutes. 
I'm not wearing a bra either, I just hate wearing bras, thats more comfortable but what can I do to make the pain go away and that sore feeling?