If subliminals even work, then, yeah, I'd say that you don't need junk like that rattling around in your head.
I agree with you in the notion that we probably have many different conceptions of ourselves. I think this is probably a very helpful thing. Getting hung up on any one notion can be a bad thing. I guess the thing is not to take your guesses (judgments) about yourself too seriously.
A la NLP, you will never have one true notion of yourself. You only have a model, or rather a set of models, which you can enrich. Different models, thoughts, or beliefs are more or less available to us depending on our state of mind. State dependent learning and recall and all that.
Also, ever notice how good you feel and perform when your self-concept isn't even invovled?
