@QuinnPerkins - my best effort at breastfeeding was with ds3 - I mixed fed him for 12 weeks. I gave a bottle at his bedtime, and another for the last feed of the evening, and the rest was me. It really can work, and work for both mum and baby, and we are proof of that.
My mental health suffered, in part due to my struggles to breastfeed the dses. I blamed myself and have beaten myself up for years about it. I fail to see how carrying on struggling, and getting more and more depressed, would have helped my dses.
Not to mention the fact that, despite feeding ALL the time he was awake, ds2 lost 10oz from his birthweight, and was nowhere near regaining it at 6 weeks old - hence the hospital staff labelling him as Failing To Thrive. He didn't start to gain weight until I started topping him up with formula. Sadly topping him up after every feed (as the medical staff were insisting I do), killed my supply, and spelled the end of breastfeeding very quickly.
With ds3, I made the choice to mixed-feed from early on, and doing it the way I did - the two bottles, early and late evening, worked, and allowed me to carry on breastfeeding him twice as long as I'd managed with either of his brothers. I did try to cut down on the bottles, but unless he was having two bottles of formula a day, he did not gain weight.
Back then, there was a lot less information readily available - it was before the days of the internet, so I was reliant on the local NCT and my health care professionals for advice. I firmly believe they did their best, with the information available, and I am not criticising them one bit. But I do wonder whether there were things I could have done or taken to improve my supply. I tried pumping with ds1, but after 10 days of pumping after each feed, I produced exactly the same amount of milk as I had on day 1.