Who and What to trust?

So many times, we think what we are doing is because it is something we want to do. Something in us tells us, here do this. But is it really?
Who tells you, that this is what you should do? You? Who is then this "You"? Is it just a version made by us to survive in this reality? If yes then this "You" can change. Meaning vanilla might not be their favorite flavor, "You" might enjoy hazelnut as much. I am fascinated by these aspects of reality. Why do we have to make these choices, can we like all flavors of icecream? Nooo, that would still be "You" just a version who likes all flavors of icecreams.