In my view we are agents that make a living in the world. All that we are is ultimately tuned for life protection and procreation. It's a game, and the prize is being.
In this view the premise of the title is flawed - my instincts are an integral part of me, participating in my survival.
"I", in the sense of my ego and my perception of myself, will want things that my brain doesn't want.
A morbid example of this is holding your breath. I don't think there's ever been a documented case of someone able to hold their breath beyond the point where their brain forces their airway to open!
If you are underwater, you die :(
We can have identical twins but you can never have identical personalities.