Hard and fast beliefs about one's own limitations are almost always a sign of pathology, a short circuit of the process of understanding oneself. Nothing much is actually unthinkable, places where thought wants to stop are places worth looking into, in my experience, anyway.

Shivering masses of tics, patterns, dispositions- the stabilities in the apparatus actually make it safer to experiment on, most breakage is merely apparent & shows new possibilities, when looked at properly.

A good index of the state of one's mental health is the ability and the desire to try new things.