My 20s were kinda horrible, TBH. After years of no problems at all, my stutter reappeared in my mid-20s thanks to the circumstances of my life at the time. And it hasn't gone away, it comes and goes with the normal ups and downs in confidence everyone goes through and I imagine my stutter is something that will always be with me at this point, but I feel like with each passing decade I've quit caring as much. Not just about my stutter, it's just that you begin leveling up as you age, unlearning the conformity of your teens and 20s and getting to do your own thing, and let everyone else think what they will. So now I'm in my 40s, I'm overweight , I stutter, and I probably have 1000 other flaws, and I'm still living my best life. Friends in their 50s have said it only gets better with time. 20s are like your physical peak, but definitely not your mental or emotional peak. Work on yourself. Get speech therapy if you can. Develop your interests and personality. People who matter in your life won't care about a stutter.