Heya dude. I was the same as you until last year when I was 25. My stutter affected my life every day mentally. It was rough. I don't know why this happened, but I was in a shop queueing up to buy something, and had a long line of people behind me. I was aware that I was going to be asked some questions like signing up for the shop loyalty program, email address and so forth; as you can imagine I was stressing out big time. Then out of no where I just sort of had this epiphany, something like "why the hell are you so anxious? Own it, there's nothing to be anxious about". The amount of calmness I felt was mesmerising, and I stuttered when my turn came. However I stuttered because it was my choice to if you know what I mean. The lady at the till smiled and was patient, and I walked out with no shame at all. I guess what I'm trying to say is, even though it may feel like an impossibility to essentially not care about it and to own it right now, there'll be a day when something just triggers it in your brain and BAM, the shame is gone and your speech should improve naturally. It may not happen for a while, but in the meantime I'll say to don't let your stutter defeat you. If you need to make a phone call, do it right away before the anxiety eats you away for example. Count the wins, not the losses. Best of luck!!!