I managed to become disfunctionally antisocial

I know I'm not the only one who is antisocial or uncomfortable with talking to others but recently it has been getting worse and worse 

Any time I see someone that I know my brain freezes up before starting to think how and when to say hello because there's a certain distance where you should say it and until then it's just an awkward state of eye contact 

If it's too far away it's too awkward and they probably won't hear you, but if you are to close they won't really get a chance to reply 

And what if it is not even the person you thiugh but accidentally mistook them for someone else!?

This has even the case online sometimes where I don't know should I voice my opinion on something or text first legitimately give me a break