I'm afraid my husband and I are definitely in the hoarder camp!
We lived on our houseboat for 24 years and had 3 sheds packed full of 'stuff' most of which hadn't been visible or get-at-able for years
When we had to leave, I got one of our long term friends and fellow houseboater to chivvy my husband along and encourage him to throw a lot of stuff out. We made a huge spread of all the stuff to go, as everyone walked through the garden to get to their boat (made us all a very sociable bunch, this arrangement) they would take anything they wanted so that reduced the pile for the tip!
However, we moved last August and I'm still sorting out stuff that came with us that I haven't had a chance to sort out. My husband presented me with box loads of paperwork relating to his business. It was the archive of records going back to 2004! I got some confidential waste sacks from my local council and yesterday they came and collected it for shredding. They left me another three sacks and I reckon these will be filled shortly!
There's no need to feel ashamed for getting in a pickle. It just slowly builds up and before you know it, it becomes insurmountable. It took moving house and help from a friend and my PA to begin getting straight. My PA is now helping me with getting organised and without his help, I don't think it would happen.
Be proud of yourself that you have made a start. Remember to pace yourself!