Lyric discussion by pepermintrhino 

Cover art for Oh Me, Oh My lyrics by Streetlight Manifesto

I think this one is just about existencelism (spelling?). The line "our disease" most likely refers to the human condition, and the rest is just saying that many people don't know how to handle the ending of their lives or even the progression there of because they spend much of it living as though they'll never die and putting things off until it's too late. Just my 2 cents though.