Time slipping away...

I am turning 25 on Sunday and you know what? I am depressed about it. Does that make any sense? I cannot understand what I am depressed about it. Am I dissatisfied with what I have done with my life in the past 25 years. I was not depressed about turning 24(well to be honest I was but not as much as this year). Am I not in the place I thought I would be by now? Yes I know the answer to this one. I always thought by 25 I would be married and having children. So I guess I am more disappointed and depressed. What do I have to show for my life? I have lived on the earth for 25 years and what do I have to show for myself? I pile of books I have read? A stack of filled journals? A bunch of photographs? A half finished novel?
Where does the time go? What have I done with all the precious time I have been giving?