One or two of the top selling books out right now are Japanese (I think)and are about decluttering. So I think you are definitely not alone as others have already said. I have a daughter who is pretty much a minimalist. I for some reason am just the opposite. However, like you I have started to feel overwhelmed with all the stuff and fabric I have collected. I find I am just jumping from one project to another without actually finishing any of them. Plus I am not getting any younger and need to clean out and up so my daughter doesn't feel the need to say nasty words when I am gone and she needs to go through our "estate". This is my year for that. I have started with the Christmas things before putting boxes back up in the attic. I want to make charity quilts with a big chunk of my stash and have even offered my quilt guild to come "shop" my stash for free if they need anything for a project. It's going to take a while and some perserverence (and some gritting of teeth) before I get to where I want to be but that's okay. I know I will breathe easier in the end.
My hope for you is that you too can perservere and eventually get to where you want to be. Remember, you did not acquire all your goodies in one day, one week, one month, or maybe even one year so give yourself time to get done what needs to be done to make you calmer and more in charge of your house/life. It won't happen over night but pace yourself and you will get there. Best of luck to you (and me!)