Walls

(addendum to previous post.)
He said that it is healthy for people to build walls and boundaries around themselves.  But it is always other people building walls around themselves to shut me out.  I didn't think I had boundary issues.  I don't think of myself as being invasive or intrusive.  But that's usually the problem:  I don't think there is a problem until it is too late.  My intuition and perception are flawed, damaged, non-functioning.  My early warning systems are dead.  All that's left is damage to clean up.

Are walls good or bad?