Dssynergy, (i apologise if someone's already given this reason, i haven't read all the posts).
I'd say ' I don't feel i measure up to the standards of JW'S for various reasons and the more i study or go to meetings, the more i'm reminded of my inadequacies. Which is making my depression/anxiety worse.'
If you make it that YOU are the problem not the WTS then hopefully you wont be treated like a LEPER/DEMONIZED/SATANIC/WORLDLY person, just because you can't stomach the BS anymore. IMO you should never live your life to please others.
'Above all else be true to thine self'. Best wishes.