I have never been successful in "fooling" myself in anyway. I've tried telling the intrusive thoughts to go away etc but for me it doesn't work. Of course its our internalised "bad object" that we are hearing and that for me needs to be "undone" and and "good object" internalised. We all have thses good and bad internalised objects but its about degree to which has been internalised. It also colors how I react in relationships. If someone I am interacting with triggers me I will assume things about myself negatively (intrusive) thoughts and assume things about the external world (person interacting with) and this will all connect with the internalised relating I had with my mother. Its not untill I have brought the intrusive thoughts out into the light and really looked at them and placed them can I change my thoughts. I am then able to think more rationally. Then That internal relationship that started badly in childhood with my mother and then became the relationship I have with myself and the world can be changed. But just telling it to go away is to simplistic and not a long term cure.