I think there are a few questions you need to ask yourself: Are you closing off because of your stutter or are you just avoidant in nature? Do you actually see yourself as an individual who would want/love to talk to people? Personally, as a covert stutterer with moderate-high anxiety I realised during a certain part of my life that I just love to talk to people and it just isnt right for me to be anti-social. So, I went and did just that. Started to approach people and make small talks if I can. I still do make weird pauses, awkward cringy expressions but life just goes on. It is indeed a work in progress as you should know. Try to find what are your interests and find people who relate to that.