I gave up with my girls at 6 & 4 weeks because of the same thing.
If thats what you want it is totally up to you.

I was at that point with DS also at 6 weeks. I actually had him on FF for 3 days straight. I tried maybe once a day to feed him, but the pain was way too much.
I rang my MCHN in tears, but she wasn't there. I was going to wait & ring the next day, but I couldn't stop crying so I rang them back half an hour later & they tracked her down.

I had thrush, so had to get Nilstat & use the nipple sheilds for 2 days.
Have you tried Bepanthen. Because its an antisptic it has an anaesthetic in it. You could try putting it on 15 minutes before a feed & try. You need to wash it off though. It might numb it enough to be able to feed.
It worked for me for a few days, but the thrush got worse, so it stopped working (I didn't know it was thrush, neither did the MCHN or LC, it was just a matter of elimination in the end).

I hope you can get some help tomorrow, I really do. But Bubby needs you to be happy too. Being depressed about not getting it right isn't going to help.
Do whats best for all of you.

Just remember you are a great mummy no matter what!

BTW - have you tried laying down to feed? Its another angle again that might take some pressure off the crack.