I've been in your shoes, hence why I moved servers. People who were my friends called me all sorts of things behind my back and then act all nice to my face. This all led to my depression and anxiety, which I had under control for the longest time, to start to resurface and lead to suicidal thoughts, severe depression, and anxiety attacks. Took me a while to even feel like talking to people again but from my experience it took time to cope, and then when I felt like I had coped a bit, I started to slowly open up and talk to people in my FC. You don't have to be super chatty at first, just simple 'hellos' will do and a little light conversations to get the ball rolling. Lets people know that you're there and you are willing to talk and from there you can come out at your own pace.