Student or Learner
Lisa, I know you really want to do a good job, and that's wonderful! But when you're starting a new career/job/work/calling/vocation, you have to learn not to take things personally.
I presume all of the underlined words work with the above context, but there are slightly semantic differences, aren't there? Thanks.
The other choices are fine. There are slight differences in the type of occupation with the use of career/job/calling/vocation but the use in this sentence retains the basic meaning.