I was listening to it in a store randomly yesterday. It was done by a male singer and sounded vaguely “indie.” The only lyric I remember is something like, “Right now, [something something], someday we’ll laugh about it.” Sorry for the vagueness.
The only song I can find with the lyrics “now” & “someday we’ll laugh about it” is by Krezip and there’s no way you could mistake the singer for a guy 
Hey There Delilah?
Sorry…that’s not it. This song has more of a harder, rock feel to it.
Removed suggestion, couldn’t get lyrics to match.
Every Other Time, by LFO? http://www.youtube.com/watch?v=wnGUkfZj3YE
Not it either. Sorry, you guys. These hints are pretty vague, I know…Maybe it’s unfindable?
Searching for the keywords “right now” +“laugh about” on sing365.com yeilds 4 results.
- Trophy Scars - Chapter One: How To Fail Yourself
- Brie Larson - Shoebox
- Good Charlotte - Say Anything
- Swingin` Utters - Sign In A Window
#2 is a female singer so you can rule that one out. How about the other 3?