How can (or how does) clutter, junk and a generally speaking messy apartment affect one's mood or behavior?

I know how you feel sometimes when the house is mess i cant do anything untill i clean it. I think if this is really effecting you then to just take one day maybe a saturday or a day when your not doing anythinng and clean the whoolleee apartment. maybe have someone who really knows how to clean help you and straighten everything up so you have a comfortable place to do the things you need to do at home. I know how its reallly hard to do things when theres alot of junk laying around. and i know how it is hard to throw away things but sooner or later your gonna have to you cant just keep all this stuff storing up in your apartment. if theres so much of it then maybe you can rent like a storage area that way you dont HAVE to get rid of it but still have it NOT cluttering up in your apartment.