Was going to post earlier but had to go to the shops, so have come back to this thread.
Your story pulled a few strings with me so felt like I had to post.
When I found out I was pregnant I had literally just started my first year of uni. Finished my first year and moved to where my parents lived, the had just moved to a new town and I knew nobody!
I had pnd for a good 10 months after having dd due to feeling just like how you do now. It was horrid, and even now i still get quite down some days. It tough.
Initially when I went to baby groups I hated it, I had lost all of my confidence to meet new poeple etc. Apparently being a 20 year old mum in a new town, minus a scottish accent, well, it didn't sit well and I felt unbelievably excluded.
I did go back when my pnd lifted and it was still kind of the same, but I got very lucky. The women at the group I went to all left and a new group of girls came in. A new group who I now call friends, and I have been out with for a night out, who I meet for lunch to have a moan and a gossip. They're really nice women and I'm so thankfull for having them now.
I will also tell you that I have just gone to the shops wearing a tatty old pair of jeans, no bra, my pyjama top, no make up and no shower so very dirty, minging hair. I think even dd (20 months) was ashamed to be out with me.
I know that it isn't easy, and I know that you'll feel as if you have no energy. But you have to make things happen for you, because no other bugger will. As hard as that might sound, if you can just muster the energy to say, right today I will go for a walk and do some washing, and do it, then you will feel so much better.
Don't set yourself huge targets, just little ones. And build it up from there. Instead of giving yourself a list of 20 things to do, just do a couple and that way you wont feel bad if you don't change the beds, or hoover the carpets etc. Baby steps.
Try out all of the baby groups where you are and find one that suits you, and stick with it. A lot of the time the women at the groups don't mean to be clicky, they're just so happy to be out the house to talk to friends that it can be easy to miss a newcomer.
Don't be hard on yourself. I think you're doing really well.