I too have been called a liar and not taken seriously because I fake so well on the outside.I am the "strong one" to all my friends.
If you can't talk to people you know at least try to talk to someone. A therapist would be the best option but the most important thing right now is that you connect with someone. Coming here is a good start.
Please stick around, keep us posted and share what you can. Even if it is just stuff in the social chit chat section. Social anxiety is a bear to deal with, it has taken enough from you... Time for you to start taking some of yourself back... but baby steps! better IMO to take it slow and steady than to go too fast and have a setback.
Posting what you did was a brave step. I hope that you are able to be proud of yourself.