I had to do an almost complete overhaul of my friends group years ago after making a lot of progress with some personality disorder / trauma-based issues. The types of people I had attracted while so terribly dysfunctional.. well they no longer matched well with me after I had made a lot of progress, will put it that way. It sounds like this may be the case for you, as well, to some degree. If you normally are too anxious and shy to do much with people, then chances are that some of your "friends" are not true friends. Maybe not all, of course, but I would imagine the chances are high that at least some of them are actually not true friends to you. This may not even mean they are 'bad' people or anything like that. But basically I think that for many, once you've committed to making progress, you really have to just dive right in, leap of faith that ****. Which often means meeting new people and making new friends, but you can start with just making chitchat with people you encounter, like coffee shop staff and whatnot. Small steps for big, positive changes.