You sound a lot like I did in my mid twenties. That’s when I got so fed up with my stutter that I think I borderline read everything ever written on the topic. I just want to tell you it can get better. Maybe not cured (at least for me) but certainly better. My stutter is barely noticeable now and most importantly for me the anxiety Isn’t there. I give presentations for work a lot and I don’t really get nervous at all anymore. For me it was more working on the mental side of things that finally made a difference than any speech techniques but everyone is different. Anyhow, you sounded down and I just wanted to offer some encouragement.