Depression only affect your health and loss of opportunities in life.
Found a very good article about personal development and one of the sections talk about "stop worrying". Worth reading.
http://www.srikumar.com/personality-development/
A quick quote from the article:
If you want to avoid worry, do what Sir William Osler did: Live in "day-tight compartments." Don't stew about the futures. Just live each day until bedtime.
AND
"half the worry in the world is caused by people trying to make decisions before they have sufficient knowledge on which to base a decision."