Does considering your mortality motivate or depress you?

In Steve Job's famous commencement speech he said "Death is very likely the single best invention of Life. It is Life's change agent." and "Your time is limited, so don't waste it living someone else's life." I think about death a lot actually. I have a 'loading bar' tattoo on my right wrist that represents 100 years and it's 1/3 full (I was 33 when I got it). I feel extremely motivated considering my mortality, but some days it's hard to not find it depressing. How do you cope with the very real fact that we all have a limited time? Does it motivate or distract you when trying to make your dent in the universe as you build your startup?