I do not accept that I have to justify my life; I am here. Crabgrass does not justify its life? It too is here. If we choose to wile away time just thinking/day dreaming or doing "nothing" that is our choice. However, we are responsible for ourselves once we grow up and it's hard to pay for food, shelter, and clothing with day dream dollars/action?

Life is both short and long and all we have, actually, is this moment. You can think that yesterday was "wasted" but you cannot prove it because it does not exist and all of yesterday was not yours, just your part. It could be that if you had decided to cross the street to see how the elderly neighbor was doing that you would have been run over by a car. Go now, instead, and may you will/maybe you won't be run over by a car but you cannot go yesterday, or tomorrow because neither of those actually exist except in our heads/imaginations. What you did/did not think, feel, and do yesterday is all in your head and if I were there with you, how I reported what I thought you thought, felt, and did would be completely different.

Decide what you want to do right now, this minute, and work on it. That's all that matters.