You’re not a failure OP. BF isn’t as easy as it’s made out to be! They should be more honest and say it will hurt, it may bleed and it could take weeks and weeks before it gets better.
They don’t though so poor mums are left feeling like it’s not working because it’s supposed to be easy etc...
There are other factors as well such as how the baby latches on, if there’s support there when you need it, if you’ve fit the type of nipples that bleed more easily, if you get mastitis, if you’re baby is particularly hungry and wants to feed 20 hours a day.
There’s lots of things that make it more difficult for some mums. I also think the advise of not combined feeding makes it more difficult for mothers that want to continue but are really struggling with baby latching etc... combined feeding gives you the respite and your boobs the chance to heal.
At the end of the day, we do what we can as best we can. Some people have it easier/harder than others.
I lasted a few weeks with my first then I gave up after beating myself up. My nipples were bleeding to the point the milk was pink and after lots of guilty tears, I decided enough was enough. It was the best thing as baby was happier as was I.
With DC 2 a few years after I didn’t put myself under the pressure and thought I’m if it works great, but if not we’ll be going to bottle.
It was easier with DC2, perhaps I was more relaxed but I did combine feed so it wasn’t totally breast which some people would be aghast at. But DC was a hungry baby and I couldn’t fill them.
Top and bottom of it, they’re both great eaters, neither gets more poorly than the other and the one DC1 is super clever - do the amino acids in the cartons must be better than my milk!!