I have quite a stash of fabric, but I have donated a lot over the years. Several years ago a neighbor of a friend was looking for material for boy scouts to make pillow cases, I gave her quite a bit of fabric, mostly novelties that I figured I would never use. This past year my local sewing machine dealer was asking for donations for quilts for kids - they didn't care how large or how small. I have them a lot also.
But since joining this group I have been so inspired by all the projects that are shown that I am now really into using up my stash by making projects I probably would have never even thought about. If you donate some fabric that you are almost certain you will never use, that's okay. If you have quilter friends, maybe they can give you some inspiration as to how to use up some of the stash. I totally understand about needing space, I don't have the shelf units or the comic boards on which to place my fabric, it's all in totes, large, medium and small.