The sun doesn't need you rise

What do you mean when you say
"You don't know what you're doing"?
I just know what I am doing
I just know what I wanna do
I just know who I wanna be
I just know if I'm right
The sun rised at this morning
Just like at several mornings
You weren't sleeping, my old friend
You didn't see the sunrise
The sun doesn't need you to rise
You have fought with yourself
Everyday of your sterile life
Oh no, you are not blameless
You'll just have to pay, old friend
The highest price of being alive
It doesn't matter the time
You must leave anyway
You can't look at behind you
'Cause you won't miss anything