You might want to consider getting your LPN license and working as an LPN while continuing to take courses toward your RN. Get the history course out of the way first. Then get the sciences done one at a time so that you do well. Let the nursing courses take care of themselves when the time comes. You don't need to worry about them now. That advisor was probably giving you her negative spiel in hopes of dissuading you. Some people get a sick satisfaction from acting that way you know. Good luck with whatever route you take. You can do this if you remain persistent.