I feel disappointed in myself all the time, a product of a childhood with parents, teachers, ministers, officers that saw me wanting.
The thing is, they totally lied to me regarding what life and survival in society was all about. And they were half-assing it all this time. In fact the phoning-it-in is consistent from the average menial laborere to the President of the United States. They're not even trying to do a good job.
So in my case, while I'm disappointed in myself out of an old habit, I am disappointed in my society more, for established valid reasons.
And whatever your vices are, whatever your character failings, you are valid too. Character doesn't come out of a vacuum. You were made this way.