We're plastic

Neuroplasticity is the brain's capacity to rewire itself over time as response to lived experience, trauma or injury. It continues to function for as long as we're alive and permits us to restructure our thinking in ways that benefit us. 

In other words, we aren't stuck if we don't want to be but repair can take a long time depending on our situation. 

I remember someone who entered a religious sect at 17 only to finally leave it near age 60. He abandoned religion altogether after the long journey of realization and self discovery. His initial fervor had been whittled away to nothing. 

All of us begin life with some level of indoctrination which must then be assessed and weighed. We must determine how much of it served us and how much turned out to be detrimental and antithetical to our essential natures.