I can imagine that this could easily lead to hoarder behavior. You're not sure what normal rooms are supposed to look like, so you just keep everything. My mom definitely has a tendency toward hoarding. She's now learning to go back and get rid of things she won't be using. She also grew up without much money. And my stuff can easily take over common spaces if I don’t take special care to get rid of papers and organize things somewhat regularly. I’m also ADHD and organizing does NOT come naturally at all. Good for you for addressing this now and getting help!