I’m 18 and seem to have exactly what you have. You cannot control your stutter in the fact you can choose different words or how to phrase it, but you cannot bypass it always especially it you stutter on a multitude of words. People also don’t just stutter on the same words, I for instance, stutter worst when starting my sentence and have to cut off the first word or to and hope context fills it in. If your dad really thinks you change change it entirely or get rid of it, he’s wrong. He’s not wrong about looking at less technology to make your stutter better, but he’s right for the wrong reasons. It’s because if you stop looking at technology so much you gain the time to better yourself, I found working out, cold showers, and being on my A game overall helped with my stutter a lot. Now this week has been extra bad for my stutter but it happens, ups and downs. Anyways good luck!