my borring Job

Many people complains about the jobs that they have.Most of them want to quit when they dont like their job, but the others have to work,eventhough,they dont like their job very much. I'm one of person who quits his job after long time.I don't know why,but each time I get a job, after four or five months later I want to quit. it is not that i dont like my job, but I feel like I dont belong there anymore.As you guys know,I start working in Staples since december,07. Everything is great so far,but I dont feel like to go there anymore. By the way, there is a great sales on laptops and desktop computers if anybody interested.