Time Flys

Why is it that vacations seems to go a lot faster than when you work? Why is it that my month and a half of school seemed to have flown by and yet, the next 4 months are going to seem an eternity?
Its strange though because I remeber the time when I was in HS and everything seemed to be moving at a slower rate back then. But now that I am a year away from getting the heck out of college, everything seemes to be moving super fast. Its like, I have to take hold of my future now and decide what I am going to be doing for the rest of this life. Does it ever seem that the older you get the faster time flys?
It makes you think that 1 year doesnt seem like a year anymore and 5 years doesnt seem that far distant, yet you ask yourself, what have I been doing with my life so far? And then you wonder, If my life is going this fast, I think I better do something about it and it better be the right thing, cause you dont know how much time you have left to change, because in essence time seriously flys fast...