You won't be a different person, but you will be a person who makes a difference,
As a nurse you make a huge difference too, so ask yourself what the motivations for becoming a doctor are. The degree is too hard to get through unless you have a real passion for medicine or you are a rare natural academic.
I would 100% recommend anyone becoming a doctor, but say goodbye to the next 15 years and be sure to realise it is not just a job, it is all consuming.