I understand you completely, I'm also a teenager and none of my family members ever stuttered and I don't recall any trauma. although my stutter is not severe I have blocks in my speech and I sometimes can't speak fluently. Something that I have understood lately is that when I'm around people I stutter way more not because of my stutter(I know it's sounds wierd), but mostly because the anticipation that I will stutter. The social anxiety that I have because of my fear of stuttering amplifies it even more. I don't know about you, but in my case I just tend to take my time if I'm noticing any stress or overwhelming situation I try to slow down, and be as calmed as I can. Anyway I wish the best for you and I know that you can get over it and learn how to live with it(not that I'm there lol 😂), good luck in school to the both of us👌. An extra bonus hopefully it will make you feel better, in my school I'm in a special class called "nachshon" which you have to pass some tests before you get in(this is my native language btw). In that class it is all about leadership and presentation, we often have debates and conversations in class and I'm saying this not show off, but to show you that even someone who stutters can be in that kind of stuff and do anything that he/she wishes to do.