Unselfconscious
Part of speech: adjective
Definition: Not self-conscious; natural and genuine
Unaffected
Part of speech: adjective
Definition: Lacking pretense or affectation; natural.
Example sentence: The hardest thing about acting is all of the other things you have to think about besides performing... Your image, your team, networking - not to mention the mental strength you need to be able to stay unaffected by the rejection that every actor experiences.