That everywhere in the world people are suffering.
Somewhere at this very point in time, someone is being tortured, hostages are being held captive, someone is being raped, girls are being punished for studying, and maybe, just maybe, the homeless guy and his little kid you pass everyday haven't had lunch for days.
And so, you should keep it in mind that your worries may not be the only problems in the grand scheme of things. Just the realization that millions of people would do anything to see their kids sleep for a night in your bed, or wish that they could eat those vegetables you just trashed, would do our planet a world of good. So maybe folks our lives doesn't suck so much after-all.
Sorry to be the breaker of bad news!