Having extra food is good in my book. Spending on clothes you might not even wear is a whole different business. Better use that money on something else. You could stop buying books since you already have a bunch, if something really interests you, borrow the book instead. And don't forget to rotate the cans so they don't get wasted.

Rather than trying to change radically, try to figure out what in the "hoarding" that makes sense. Some of it does.