Why do we wish our lives away?

I have the privilege of working in an office environment. Well, I say privilege only because I am not cut out to work outdoors. But, it seems like we are only working for the weekend. Why do we spend all week wishing it was the weekend? We don't do anything special on the weekends except rest up for the next grueling week. I just wish we could all figure out what we would enjoy doing and be able to make a living doing that instead of having to do what is unsatisfying. Additionally, I work at a desk all day. I have just recently realized how detrimental that is to our bodies. Now that I am getting close to 50 (shhhhhh! Don't tell anyone!), I have more aches and pains than ever. I know, I know, lose weight and exercise. Take the stairs, drink more water, yada yada.