Next time you go to a shop, ask a shop assistant where something is. Next time you want something to eat, go to the counter rather than self checkout. Start a hobby and tell people it is your first time there, you will find a lot of people are open to you. I would really encourage you to start a journey of self reflection. It is easy to get stuck in your own head about how much you stuttered and forget what you accomplished. Shifting that mindset to "I did something I couldn't do yesterday." "I asked for help and I received it." etc etc will help you build confidence. If things don't go well, spend a bit of time thinking about why. I genuninely think that 80% of my negative experiences could have been improved if I had done something different. This is often disclosing I have stutter so the person i am talking to knows what is going on. Perhaps I was super anxious or jumped into a situation not knowing what to say so it was just awkward anyway. Maybe journal your social iterations. You may see that your fear of social situation is unfounded. You may be fearing negativity but find the majority of social iteractions are good or neutral.