Having a stammer holds us all back it’s horrible. I’m in a similar situation Michael, I’m in my last year of sixth form and I dread things such as presentations, I would usually bunk school and it sacrificed my grades, but all that mattered for me is that I avoided an anxious situation and I honestly regret it but I can’t do anything about it. To help socialise I also went to the gym (and still do) and yeah my confidence has gone through the roof but can relate on struggling to socialise especially if someone asks me a question, I panic and I just can’t get it out. The best way I look at helping my stammer is by being more outgoing and doing something, the more people I talk to throughout the day the better especially if I make them happy. Hope this helped