You may also be interested to know that there is such a thing as 'anti-social behavior' This is from Wikipedia: Anti-social behaviours are "age- inappropriate"[1] actions that harm or lack consideration for the well-being of others.[2] Many people also label behaviour which is deemed contrary to prevailing norms for social conduct as anti-social behaviour.[3]

They are not against society necessarily, they just don't like to socialize with people. Meaning, they don't like to be around people or talk to people or make new relationships with people.

You're right. Anti-social means to not be social. An antisocial person is usually a person that keeps to themselves, and doesn't enjoy talking to others. for instance if you're somewhere with a group of people and everyone is talking except you, someone may say "why are you so antisocial today?" Which basically means "why aren't you saying anything"

Yes, you're right! It means a person who is not social