The first thing is do not overthink the decision, it is very important as are most big decisions, but it is not life or death. You say you are most interested in Nursing, a wonderful profession but, like all professions there are many aspects or branches of nursing. Have you explored all branches of nursing? Have you volunteered to work in a hospital or nursing home to see what the various branches of nursing are? Some people really like working in an emergency room, others hate it (too much blood) but love working with children. You get the idea. If after really exploring nursing it may no longer appeal to you or you may decide it is something to look into further. If not, what is next on your list to explore? You say you like math - what about being an engineer. Engineers design medical devices among millions of other things. In my opinion, most people do not know 100% what they are going to do for the rest of their life. All you can do is make a serious effort at researching a field you like and go for it. I knew absolutely noting about the field I went into, but the more I learned about it the more I like it. You may also find that after spending several years in an area that you don't like it, you can make the change to the field you have decided you do like (not always easy but not impossible).
Do the best you can researching/selecting a field and then work at it. Trust your initial instincts - they are often right.
Good Luck, hope this helps.