Weekends

I think it's strange that every time I'm on vacation I have the need to do something productive, but when I'm at school I don't want to do anything but lie around, eat cake or check my facebook on every half hour. The will to do something different than what we're doing must be a natural human feeling. "The grass is always greener on the other side" makes complete sense, so how do we ever find satisfaction in what we're doing? I enjoy knowing that I'm getting an education and knowing it will help me a lot in the long run, but I never really want to go to class or do the work...however I do what I have to do... even though all of us don't want to do a lot of things we do them, and even though we want to do many other things, we suppress those feelings. Why do we torture ourselves into doing things we have to do to help us in "long run."