I know what you mean - it's like therapy is kind of 'proof' that there is something wrong with you. And when one already feels flawed then this just seems to magnify it.
I'm unsure how helpful therapy is if you genuinely don't want to be there but it does sound really concerning that you feel you have hit rock bottom. Like it's a time for extra support - not less (as I said before!) In any case, good luck with the decision