MuddyWaters, you need this book:
http://tidyingup.com/books/the-life-changing-magic-of-tidying-up-hc
It will radically change the way you think about your possessions and help you to release the things you do not need.
Japanese organizational consultant Marie Kondo takes tidying to a whole new level, promising that if you properly declutter your home once, you'll never have to do it again. Whereas most methods advocate a room-by-room or little-by-little approach, the KonMari Method's category-by-category, all-at-once prescription leads to lasting results. In fact, none of Kondo's clients have been repeat customers (and she still has a three-month waiting list of new customers!). With detailed guidance for every type of item in the household, this quirky little manual from Japan's newest lifestyle phenomenon will help readers clear their clutter and enjoy the unique magic of a tidy home--and the calm, motivated mindset it can inspire.
Or, you could move to a smaller place. That is what helped me - I went from a two bedroom townhouse to a bachelor pad. I got rid of 80% of my belongings and what a relief it was. Once a person gets rid of all the stuff they don't need, it also changes the way that you accumulate things. I don't buy crap anymore - I only purchase neccessities. And things that give me joy.
Good luck - the bottom line in deciding what to keep is this: "Does it give me joy?" If it doesn't, get rid of it.