Where have you gone?
How Does time pass by so fast
Seems like yesterday
You and I
We Could Relate
But you know how things change
But is it me? Or is it time?
Now I'm stuck looking back
On something that I'll never have again [ Lyrics from: http://www.lyricsmode.com/lyrics/c/comeback_kid/all_in_a_year.html ]
All this time with regret
I Just Lost Today
Worrying about yesterday
Can't live in yesterday
All this time with regret
I lost today
Worrying about yesterday
I lost today
And No I'll never forget about you
I lost today
I just came to terms that I've lost you
Basically stating that one cannot self induce suffering, may that be mentally or physically, based on previous actions. "on with my life" suggests "what's done is done", time to advance further into the next step in life.