I mentioned this in a nested comment as well, but I have found the /r/AvoidantAttachment subreddit to be a supportive community for people with avoidant attachment. It also has a list of resources on the sidebar for learning more about that attachment style and for learning to work with it better/more healthily. I've been working on attachment issues in therapy the last couple of years and have found it really helpful, it has made a big difference in my life.