I'm almost 21 and the worst stuttering years for me were my school days, those were the days I hated.. i stuttered a lot because of which kids also made fun of me.. but after my school years.. I started making significant changes to my thought process and started to better myself whichever way I can I still stutter but this time around the people I have surrounded myself with don't care that I stutter, and they genuinely have fun being around me My advice would be to start going to the gym. I know it would be scary at first but trust me it will be a cannon event in your life.