As far as we know time is finite there are 168 hours every week. So for the sake of argument, let's say you sleep eight hours a day, which takes away 21 hours each week of your time. So of the 8064 hours in a year, roughly one-eighth is spent sleeping. The rest of your time is spent on your selected and unselected voluntary and nonvoluntary activities, which you can either control or not. Thematically, even if you don't think of time as a series of separate activities you can't allow it to be directed by somebody else.
You can either spend your time with no clear goal in sight or invest it as Warrent Bufett suggests about investing in the stock market.
Warren Buffett said, "Successful investing takes time, discipline, and patience. No matter how great the talent or effort, some things just take time: You can't produce a baby in one month by getting nine women pregnant."
So here are some things you could invest your time in:
Invest in yourself by honing your skills. Read, read then read some more about things in your field and things that stretch your mind like philosophy and biographies. I am reading the biography of Robert Mosses called "Power Broker," it is a mind-stretching biography that challenges my thinking and values.
Set up small habits and activities that you can do daily to organize your life. I have a regiment of routines from morning to evening to deal with my psychological, physical, and work needs. Find what works for you, and do them until they feel as easy to do as breathing. Don't give up, if they aren't working; change your routines to meet your needs.
Milles Davis," Sometimes you have to play a long time to be able to play like yourself." Be yourself.