it will get easier, moreso when the cracks heal up. with my first baby, i got blisters from her wrong attachment (she wouldnt open up to let the niple in but instead sucked the nipple in if that makes sense?) and i got blisters on both sides- and as they healed, the scab covered ALL the holes for the milk to come out. so everytime i fed, the scabs would soften and come off and it felt like my boobs were on fire.
it did get better. i went on to keep breastfeeding for 4 years straight, moving on from one to the other child. what i used for the scabs to heal, was i picked the worst side being my left. i stopped feeding off it for 1 day. in that time, i only expressed for comfort (this was at about 2 weeks post birth mind you) so i was still pretty full. hot wet facewashers helped soothe the pain, and i let them have a bit of air time, i was using bepanthen on both nipples and wiping them clean before a feed. still swear by that stuff it was amazing. and i;d express a bit in the shower or into a cup if i got too full. by the end of the 24 hours, it hadnt healed completely- but, it was enough rest for me to put bub straight back on that boob (i;d only been feeding off the right side for that day) and it still healed up after a few days. i repeated this on the other side and same thing happened- it healded up. i got mastitis before i used this method and oh my gosh thought i was going to die, the hot sweats, lethargy, it was horrible and i didnt even get a red patch or hardness or anything til the day after.
but yes it does get better. it will be trying while you are going through this but once the nipples heal, it will be much better, i guess the pain can take away from the rest of the things you think of while bf