Hi. Are you me? I could have written the same thought as 21 yo. When I was 22 I found a good intensive therapy in Czech Republic and was 1 year without stutter. Now I am going to do another intensive therapy in Germany, this one looks waaaay better. I met already people who are f.e. 9 years after the therapy and they are 99% stutter-free. So yeah, it is worth it. The only downside is, that these intensive therapies cost several thousands USD (or even more than 10k), but if you can save some money, it is worth it because it can change your life. Just choose a good one.