I know we shouldn't blame alcohol for 100% of our problems- but once you quit, you sure do find a lot of problems it was responsible for.
For me, that "I am sh**" line was huge when I was drinking. In fact the voice would be far far worse than that. It would literally say "you should just kill yourself".
I never came close to that, fortunately. I regarded it as a melodramatic self-appeal for help. I thought that was just me and my self esteem. What was fascinating is how that voice went away when I stopped drinking.
I'm sure our inner psyche is a rich tapestry that cannot be unraveled completely- but I can't help blame alcohol for this one. Give it a couple more weeks and you're likely to see some very significant changes in yourself.