Yet, I must say there is useful guilt and wasted guilt - in my world I consider the majority of it wasted as it's usually dictated by pathetic 'authorities' or people with no real problems to deal with - and they should relish their good fortune instead of judging.
At the same time it can be a compass which guides us in our endeavour to do what we need to do because we are humans who live in a society and do our utmost to uphold a certain level of civilization.
So what does your guilt motivate you to do? Is it a positive force in your life? Do you find its results are derived from real sincerity or merely guilt shaming?
Now, before I start philosophizing my blurb to ridiculous heights, let's apply this guilt to stuff. Why do you have or keep what you have? Stop reading, look around from where you are and ask yourself this question. Now answer it honestly - no one can hear you so be candid. Oh wait, I can hear you - 'it was a gift, it belonged to (insert name of important person in your life here), this item is from when I...etc etc'.
Listen closely mes amis, I say this with complete understanding of your struggle - think of what is best for you - it may be time, and ok to just let it go. It may not be, only you can honestly say, but please think about it. You may come back to a certain object in a day or two or week or two and then it may be time.
If you were hospitalized or had to go to the aid of a loved one today, your everyday life would come to a halt. So when you look around, is this stuff worth keeping - if your family members or a babysitter or friends or a maid service had to come in to help out, is this what you would want them to have to wade through?
Serious life changers have a way of changing how we evaluate things, people, relationships, our own goals. Food for thought.