Tips for a stutterer.

Tips for a stutterer. so i am 16 and have stuttered pretty much my entire life. It primarily happens when I'm trying to start sentences and it slows down conversations and just basic talk in general. this has caused A LOT of anxiety and worriedness when for example i have to give a presentation or school or walk up to a coffee stand to order something. does anybody have any tips on how to help start sentences or sort of ease into them? i have been in speech therapy since age 11 and it has helped somewhat but not a very noticeable amount.