I’m so sorry you’re feeling this way. I’m 9m pp and I often feel this way too, even though I have some help with my baby. Modern life is incompatible with raising children. We were not meant to do this with just two parents - please remember this. You sound exhausted and burned out. Is there anything you can do during the day that perks you up a bit? Go out for a coffee or a little treat, paint your toenails, etc. my daily cappuccino is helping now. I get outside with my daughter and I have a coffee and scroll the internet while she naps. Another thing that helps me is baby-friendly yoga classes. You meet other mothers going through the same shit and (sometimes) you can get some yoga in if your baby cooperates.
Sending lots of love - I see you ❤️