It's incredibly difficult for a lot of people. In my experience the people who say it isn't that bad were in quite fortunate circumstances, recovered fine from labour, had lots of family or partner support and people chipping in to help, a baby that slept a good few hours at a time, didn't have major problems with feeding. And good for them! I have friends who felt that the entire time with a newborn was just a big doss sat on the sofa cuddling them while watching boxsets haha.
But for lots of people it's really, really, really tough. For example our baby had issues with weight due to my insufficient milk supply, so we were on a gruelling cycle of triple feeding. Every three to four hours meant 20m of nursing, a bottle of breast milk, then a bottle of formula, then pumping for half an hour. Changing and putting baby down meant maybe half an hour for sleep before doing it all again (unless I needed to eat). Even with two of us there 24/7 it was debilitating. DH did as much as he possibly could, so he was exhausted too, and I couldn't have a rest due to the nursing and pumping. In retrospect it would have been much better for all of us to have just moved to exclusive formula feeding very early on but hindsight is 20/20 eh.
People like to laugh and say that newborns are actually easy and toddlerhood is where it gets rough but personally I found the first six months the hardest by far, and then after that it's been a breeze. Once they're sleeping well and you're also getting some good sleep, you're in a routine so you know what to expect each day, and your body has properly recovered from the trauma of birth, you grow in confidence and get into the groove a little.
The worst part is when you confide in others you're exhausted and babe won't sleep without being held and your eyes are falling out of your head with sleep deprivation the most common piece of advice is 'enjoy those baby snuggles you'll miss them when they're gone!' haha. Which is just so saccharine and insulting... they might feel that way, but I promise you many parents who found the newborn stage hard wouldn't go back into it for a million pounds. Baby snuggles are lovely but proper amounts of sleep are the key to enjoying life and good mental health imo.
It will pass, you just gotta keep getting through each day. If your baby is still alive and fed and clean then you're doing an amazing job.