I've had the same epiphany, and was doing something about it as recently as today. One thing that stops me from getting rid of my stuff is that my dad has been associated with Goodwill Industries for years, and he is always talking about how he's donating stuff to Goodwill (but not before asking me if I want some of it first---which I sometimes take because even I get tired of saying "no" all the time). But Goodwill is like 15 minutes away, you have to put stuff in a box or a bag and haul it over there, and I've never been there before so I don't know exactly how to get there. My trash can, on the other hand, is right here. That doesn't seem like a big difference, but it's big enough that it has kept probably 50 lbs. of clothes in my closet and drawers that I never wear. I'm as resistant to guilt as anyone I know, but even I have a hard time throwing away "perfectly good" clothing that's only been worn once.