Yeah this is for sure a good situation for “fake it till you make it.”

Just say hi to everyone when you see them. Once a day talk to a different person for awhile, you will find out who is more friendly. I’m not naturally social or outgoing and I’m at at ease with that, but people can interpret it as unfriendly, so I try to communicate the way each person likes, to some extent. It may not come naturally to you but YOU ARE NOT ALONE in that. We just learned by practicing.