Could it be by starting of with the word impossisble in your head, towards a certain goal, the subconscious will pick that up and you might never get there ? :)
Basicly your telling yourself from the start it is impossible :)

I prefer everything is possible and I will give it my best shot :)
If I cannot get there even trying my best then maybe that is not the right place for me and there is a place/thing/situation/person that will be better for me, for now.
Since we change, situations and people around us will keep changing as well.

Just my humble thoughts :)

Good post :)