Hi Annals please dont think your a bad mum. Lots of women feel this way. I took me about 3 years to realise that i had suffered with ppd, at the time i just thought i was being pathetic. I wasn't, i was ill and no-one including me noticed.
I really struggled when my DD was little as my partner did almost nothing too. This lead to my DD always wanting me, as she didnt seem to understand that other people could do this for her too. She is starting to get better at this now, and her dad is getting more involved, but he still doesnt take her out, get her up and dressed or put her to bed.
We split up and month ago, and im hoping that when he moves out and has to look after DD on his own, he will begin to realise how much i have done over the years.
It is really frustrating when there is someone there that can help, but who refuses to do so. I would focus your energies on your DD and getting yourself feeling better. Go to the GP, they deal with this everyday, and will not for one second think you have failed or any of the other worries you may have. Motherhood is hard, and no matter how you try, you can never be truely prepared for it.
This do get easier 