It doesn't mean you don't like them. It means you are socially awkward or you don't have an easy time being social. Some people are "aren't good with people" do fine in very small groups of close friends or family, but would never make it as a saleperson dealing with large numbers of the general public.
If you say "Aren't you...?" it suggests you think they are (whatever).
If you say "Are you not...?" it suggests you think they are not.
Student or Learner