If you have so much "stuff" that looking at it makes you vaguely unhappy... then you probably have too much.
So then, the key is... do you know a place to give it to, where it will be used and appreciated?
If so... let it go!
This year I decided that I wanted to "travel through the world a little lighter" and gave away all of my crafty patterns and a whole lot of fabric. And... the people I gave them to were very happy to get the stuff and I feel a lot lighter for having done so.
It's been several months since I did that, and I don't regret having done it.
Bottom line... if it doesn't make you happy, why have it around?