What is this lyric from?

What does this lyric mean?

• Ok so this might sound dumb, but I'm not quite sure what this lyric means, because I'm not totally sure what the song means. The lyric is "thinking about tomorrow won't change the way I feel today". It's from the song Lessons Learned by Matt and Kim. Here's the rest of the lyrics : Tape holds things that cannot stick And keep leftovers in the fridge While lessons learned go down the drain I can’t believe everything And all the bad names gone And the good ones were all wrong And so I stayed up all night Slept in all day This is my sound Thinking ’bout tomorrow won’t change How I feel today Never let your mark erase ‘Cause broken legs can be replaced Two steps to the finish line Three sips ’til I finish mine A straw will always suck it out Close your eyes and use your mouth And tell me ’bout your song And so I stayed up all night Slept in all day This is my sound Thinking ’bout tomorrow won’t change How I feel today Can you tell me what the song means, but more importantly just the one line, "thinking about tomorrow won't change how i feel today."

• Answer:

  This kind of sounds like a relationship breakup, or a heartbreak. Maybe about that person's childhood.