Only you can answer whether or not OT is a good choice, and this is by observing/job shadowing, and working jobs that are OT related. You need to find out whether or not you are a fit for the profession. No one else can tell you this. Some people hate the profession, some people love it. Don't make a decision on another person's lack of initiative to fully understand the profession before taking the commitment to join it. Likewise, someone who enjoys the profession may be naturally resilient to the stressors commonly confronted in OT, whereas you may not be.
Graduate schools do not have a preference for a particular degree. Each OT program has it's own academic prerequisites. You should take the initiative to answer your own question by researching graduate OT programs, contacting their admissions office, and asking them if a degree in nursing or kinesiology is more preferable. Each admissions committee is different, and it is unlikely that someone will provide you with an answer that is generalizable to all OT programs.