tldr: it will get better, especially if you can put the time in
Oh OP I completely understand where you're coming from. Our spaniel puppy is nearly 2 now (so not a puppy for very much longer) and for the first year (and more) me & my husband operated an unofficial rotation system based on who wanted to get rid of him that week. Luckily it was rare that we both felt the same way at the same time.
But god it was so very very hard. He was one of 7 pups and none of the other owners seemed to have anywhere near the same experience as we did. I remember feeling utterly overwhelmed by it all, in particular all the advice that 'they're like a sponge at this age...every interaction is a learning opportunity' etc etc. Just. Not. Helpful.
And the 'puppies sleep for up to 20 hours a day' stuff. Ha ha bloody ha. Not ours. I recently found a diary we kept to monitor his routine (me trying to maintain some control but really just evidence of my insanity at that point)
We'd meet other puppy owners on walks and, as you do, ask them how it was going. I remember genuinely feeling I hated the ones who said breezily 'oh yes, it's wonderful, he/she's just amazing, so much fun'. Very occasionally we'd meet a kindred spirit and you could tell either by the slow inhalation of breath before they spoke, or the crazed look in their eyes, that they understood...
One thing that really helped us was discovering a facebook group run by dog behaviourists (force free, positive, reward based training) who provide so so much info about every aspect of puppy/dog rearing. They're pretty hardline (in terms of the force free approach but, really, how is that a bad thing?), but I'd really encourage a look if you're struggling.
Its called Dog Training Advice & Support (be careful though, there's another - bad - group with the same name. The one you want has over 300,000 members)
DTAS
I should stop now shouldn't I? Sorry. But not before I say that now, having put in so so much work/training/time into our little boy, we've definitely come out the other side and have a wonderful dog who's an absolute joy to have in our lives, so responsive and keen to learn. Also, some of the people who had 'easy' puppies, and who didn't need to put the work in early, now have challenges with their grown up dogs (recall/loose lead/prey drive etc) that they're struggling to manage.
It didn't feel like it for a very long time but it's been worth all that stress to get to this point. (still not sure we'd do it again mind...)
Hang in there.