Not to the same extent with you but I also struggle with the same thing. It's not like I'm scared of people mnamn. But it's more like I'm not comfortable being around new people. To be comfortable with people I've to find something common with them, and once I find that common ground, then I'm the most talkative person. I kinda tried to change that but unless the change comes naturally it's kinda difficult. So what I started to do is to look for a common ground with people, like fellowship and my professional interest. And that helped to some extent. I really hope this approach might help you.