Stephen Donaldson once wrote, and I paraphrase, that "good fiction is a blend of the exotic and the mundane". This is never truer than in the creation of characters.
How many of your characters have personality traits of people you've met, people you like, people you dislike or even hate? Can you honestly say your character is pure creation, with no experiential input? I doubt it, and that's OK. A good character grows and evolves with the story, reacts in different ways to different scenarios,...