I agree about not coming into the profession with ideas about being a healer, and changing people's lives. Things like this may happen in your nursing career, but only very, very occasionally.
I have been, first an RN, then an NP for 27 years, and I can think of only a handful of people whose lives I have actually changed.
Certainly you have the intellect to pass the program and the boards.
Realize there are many, many, many different types of nursing.
Realize also, that people typically come here to complain, or seek support about some type of problem at their work place.
Sometimes it's an ethical issue, or clinical conundrum.
People seldom come here to post about how much they love their job. It is only human nature to hear more from the dissatisfied customers.
As far as being fired, yes, it can happen, and I am a survivor of it.
It turned out to be the best thing that could have happened.
It very seldom ends a career. Oftentimes it is nothing more than politics, and has nothing to do with you as a nurse, or a person.
Sounds like engineering?
More often, the nurse takes stock of the situation, and goes on to excel in some other type of nursing.
As far as losing your license, that is much more difficult. Only a very small number of nurses ever lose their license.
Probably the most common reason would be impairment and/or diversion, with subsequent failure to comply with monitoring programs, ie maintain sobriety.
I invite you to research, ie google, stories of nurses who have lost their licenses, and you will find that invariably, some rather egregious conduct is involved.
My personal story is that I was a teacher who had very limited employment prospects. I became an RN, which was not for me.
But I have loved being an NP.
The world of work is very competitive and full of ethical quandaries, no matter where you work.