I'm right there with you, friend. I'm four months shy of my 30th birthday. Have been in one form or another of speech therapy since I was 5. My stutter too, is so severe it can take me upwards of ten minutes to get a four word sentence out. I too carry a notepad as it honestly, makes communication so much easier for me. I've been selectively mute for almost a year now. At first I had people telling me I was just going to make it worse, reinforce the anxiety that surrounds my stutter, blah blah blah. I've tried everything from hypnosis to cbt to NSA bullshit and nothing has ever stuck or really ever helped. At a certain point for me, I just kinda accepted that this is how it's going to be. Some people can overcome it. Some can utilize different therapeutic interventions. Some will stutter severely all their life. My grandfather did and he eventually became mute, communicating through ASL and writing. I see no problem with it, if it's truly what you want. It's a solitary life, believe me. But, I no longer feel ashamed of my stutter. People no longer try to finish my words for me, or get that look of pity or annoyance when I try to speak. No one is making jokes at my expense, or laughing at me when I try to speak.