Dude I'm the same age, what helped me is going to a regular therapist, find the root of your stutter. Once you've done that you'll feel better about it and wich at less caused me not to care as much and because of that I went from a moderate stutter to a very minor because i simply don't really care if I stutter anymore, it took me like 6 months of therapy but it's worth it. That's all I can rly say to help, hope you get better bro.