Hey 27 years old here. I want to say it's going to get better but unfortunately for me it hasn't. I have a moderate to severe stutter as well. I had a break down a month ago and almost committed suicide. I started seeing a therapist and on medication now for anxiety (buspirion). I also have a medication for depression but haven't started it yet. I just wanted to say I know exactly how you feel. The fear of speaking especially when others are around in group conversation can be tough. I really don't have any advice for you but personally I just hope one day the suffering will end either through suicide or a miracle. Stay strong friend, and I would recommend seeing a therapist. A therapist can serve as someone to take to about personal things you would never talk about or admit to in your personal life.