i also have this problem, for many years 
whenever i clean my room, those that i dont really use in my daily
life i dont know what to do with them, i like to collect things but
dont really use them so as time goes by the room doesnt look
good.... when i clean my room i just arrange the stuffs on the
table/shelves, without throwin/removin.
Then 1 fine day, i've decided to remove whatever
i dont need in my daily life and dump them into big plastic bags,
and then throw, i mean store them in my another room that only my
grandma use it durin daytime, just dump whatever i dont need in the
room
so dont think too much, just throw whatever u dont need in a bag,
then put somewhere else so that they wont occupy your room
