Thinking about quitting breastfeeding 😞

I need some advice/support. My son is almost 4 weeks old and from birth breastfeeding has been a struggle. (It's a struggle for everyone, I know). I go between breastfeeding him with a nipple shield (because that's the only way he will latch) to pumping and bottle feeding. He is gaining a great amount of weight, he eats so much it's hard for me to keep my supply up. But emotionally I feel like a wreck. I'm so tired all the time and sometimes it's hard to control my anger at having to wake up so much at night to feed and pump. I am a SAHM and I literally have the best opportunity to breastfeed as I have no commitments. But at the same time I feel like if I switched to formula I wouldn't be able to handle the guilt of not breastfeeding because "it's the best". Even before I got pregnant I wanted to breastfeed because I want my children to have the best, but I never realized how hard it can be. If any of you mommas went through the same thing, please share some advice! 😞