General antonyms:
* Socialite: A person who enjoys attending social events and being around people.
* Extrovert: A person who is outgoing and enjoys interacting with others.
* Gregarious: A person who is sociable and enjoys being around people.
* Outgoing: A person who is friendly and enjoys interacting with others.
* Public figure: Someone who is well-known and actively participates in public life.
Other possible antonyms:
* Communicator: Someone who enjoys and is good at communicating with others.
* Active: Someone who is energetic and involved in activities.
* Adventurer: Someone who seeks out new experiences and is not afraid to explore.
* Sociable: A person who enjoys company and being around others.
The best antonym to use will depend on the specific context of the sentence.