Nursing school is going to be your life for the next two years. For those that make a half commitment with nursing school, as in having a full time job, will struggle. I would try to work out something where you can work during breaks between school, but I would not work during school. I wish you the best.
I'm 20 in my first semester of a 4 semester BSN nursing program. I would say the only downfall to being young is that most of the women in my nursing program are out of my league lol. Seriously though..
If you do not like science, you may have trouble on the path to a nursing career. Most of the classes leading up to a nursing program are sciences and sciences are going to be your most difficult classes going through the prerequisites to being accepted into a nursing program