I will never understand people that live in clutter

I grew up in a house where my mom had every decoration imaginable, and left every cupboard door open, and dirty dishes all over the sink, and laundry everywhere. I hated it. I hate clutter so much. It makes me feel depressed and anxious. I am one of those annoying people that has to have their bed made as soon as they get up. I HAVE to have the TV remote and other items set up a certain way. I keep only about 2 pairs of shoes, I have 2 cups and 2 bowls and 5 spoons, 10 forks, 7 knives and 3 plates, and I will never have more. I like the simplicity of that. I like knowing exactly what I have, and where it is. I have a small box of my most treasured items. Everything else is tied back neatly, and has a place. My room is the only thing I can control, and I like it that way. My mom is the opposite. She grew up with no money and has to keep everything. I am the opposite, I want nothing. I also have many mental health disorders, so maybe that’s why. I’m not sure. I want to simplify my life in every way possible. That’s why I’m moving to Iceland. My mom is going mad with having to get rid of a lot of our belongings, as she knows that she is moving. She won’t get rid of anything though. I don’t understand why. I also don’t understand why she can’t see how cluttered the house is. I hate the feeling when you walk into a room and there is so much stuff so that you don’t even feel like you have a path to walk. Does anyone else experience this? What do I do? I also have a lot of trouble letting go of sentimental items. If that makes sense. I am glad I’m not alone. What do you use to clean? What makes you feel happy? What do you use to get rid of clutter? Any tips?