Accustomed here confuse me..is this have meaning otherwise to be feeling nutural and normal for so..
. See if you
have a weakness that you've never noticed before. If you have,
take action to correct it. Many people become so (accustomed) to
themselves that they fail to see ways for improvement

Question

Accustomed here confuse me..is this have meaning otherwise to be feeling nutural and normal for so..
. See if you 
have a weakness that you've never noticed before. If you have, 
take action to correct it. Many people become so (accustomed) to 
themselves that they fail to see ways for improvement

Answer

Yes.  The idea is that when something becomes “normal” for you, you might fail to see that it is actually something that you can change for the better.  Example: “She became so accustomed to her boss yelling at her that she thought it was normal.  It never occurred to her that she could improve her life by quitting and finding a job with a better boss.”