I don't know whether to keep silent and let people think I am ignorant or open my mouth and release all doubts

At what point does sharing your problems/hopes/dreams/issues with your friends become too much info?  That is a question I have always had.  I live my life like an open book...what you see is what you get.  As I have stated many times before, I am by no means perfect--never have been, never will be.  Why can't I share everything in my life with the people closest to me...it's cathartic to let it all out--the good, the bad & the ugly.  So why is it after I am done unloading, I feel guilty and somewhat dirty??  I am the kind of person who needs that release to send my joys and issues out into the universe where they can be applauded or solved.  But not everyone feels that way.  So...the happy medium is my next goal.