We've all been there, i found the trick with mine was to not beat myself about what i had little to no control over..i had to stop the negative self sabotaging thoughts i was constantly subconsciously repeating to myself... This was a serious anchor for my anxiety and rage bcos i could not express exactly what was in my head.. I had to let it go,with the help of a bunch of random motivational videos i understood i was not a tree and could change the outcome of my life whenever i decided to... Teenage years are rough but you'll thank yourself later if you used your teenage years getting extremely better at some skills you have an interest for..Understand your adult life is likely to be waay rougher than the average non stuttering adults but your expertise in your skillset would really ease your struggle... So dont beat yourself, learn to love yourself, be kind to yourself,appreciate yourself, work on yourself for a less troubling tomorrow..remember it starts in the mind!!! Gud luck