The critical inner voice doesn’t represent a positive sense of self that you can entrust in. Rather, it epitomizes a cruel “anti-self,” a part inside us that is turned against us. It casts doubt on our abilities, undermines our desires, and convinces us to be paranoid and suspicious toward ourselves and those close to us. This anti-self fills our mind with critical self-analysis and self-sabotaging thoughts that lead us to hold back or steer away from our true goals.

http://www.psychalive.org/self-sabotaging/