Clutter's Last Stand by Don Aslett is a great book for helping one recognize and deal with one's clutter/stuff (among others available)
What I like about this particular one - the sections are short - the illustrations are funny - and he makes getting rid of unwanted/unneeded stuff into a virtue!
There comes a time when too much of anything becomes a burden - and no longer a pleasure.
And much as I hate to admit it, sewing supplies and fabrics are in that category for me.