I’m 23 as well and It’s definitely hard for us who stutter. I usually change my words a lot automatically in the workplace and it’s very tiring. Stuttering has nothing to do with fear it’s just that we don’t want to stutter! It’s very annoying Especially in a professional job. Keep breathing and use body relaxing techniques hopefully something works but for me I’m still trying meditation and CBD which has calmed my muscles a lot.