Utterly useless

Stop.
Start.
Stop...
Start.
All these endless possibilites are getting to my brain.
Do this, Do that.
Make a decision.. NOW
But don't be wrong.
Start.
....
Stop.
repeat.
How do I know what I want, I've only been on this earth 19 years.
Thats nothing.
And when I think of that, my brain starts to think of how utterly useless I am to this world..
Compared to a planet, I am a speck.
Compared to the moon, I am dust.
Compared to the universe, or even heaven, I am utterly useless..
But my brain is ever growing, and learning, every minute, second, hour, of every day.
So I must mean something to this world..
Right?