My mum was a hoarder. Not so bad as I grew up, but ramped up massively when my brother died age 23. It was horrible sorting her place out when she died.
I have hoarding tendencies. I'm slowly decluttering as I don't want my kids to have to go through a shit ton of stuff when I'm gone. Sometimes it's hard - but do I really need all their school work from primary school? (there's 5 of them, so that's a lot of crap artwork!) and toys, books and baby clothes. No.
I also feel guilty about sending stuff to landfill, but I also never actually get rid of stuff, lots of it is broken etc. So it just needs chucking and I need to get over it.
Part of it is also from when I was depressed living with an alcoholic who never did anything in the house, and left it in a state when he left, as in half done DIY that I can't finish. I need to sort out and decorate the other rooms before I can bear to have anyone in to sort the bathroom and kitchen. As I'm autistic (and most likely have adhd) this is also another thing that makes it difficult for me - having the executive functioning is hard.
It can be overwhelming, so much needs to be done and I don't know where to start, so end up doing nothing. I've slowly realised that doing something is better than nothing, but still sometimes get paralysed by it all.
I'm getting there slowly, need to do another tip run soon, once I get over yet another stinking cold!