Introverted
Part of speech: adjective
Definition: Possessing the characteristic property of an introvert. Preferring the internal, satisfied with self, lacking interest or comfort in social interactions.
Example sentence: I always try to be myself. Ever since I was an introverted kid, I'd get on stage and be able to break out of my shell.
Introspective
Part of speech: adjective
Definition: Examining one's own perceptions and sensory experiences; contemplative or thoughtful about oneself.
Example sentence: I'm a big believer in small, dark, cozy bedrooms. I would describe myself as introspective - I feel things first, and then I think them through - and I need the enveloping comfort of a little squirrel's nest when I have to retreat from the world to recharge.