Not always. My stutter is related to trauma and anxiety. I was also very confidence before Covid (still stuttered, just mildly) and find my current heightened Covid/world ending anxiety has made my stutter more unmanageable. Speech therapy gave me useful tools, but I find tackling the anxiety and PTSD first helps more than speech therapy ever did. I suggest OP sees a mental health professional and from there, if it’s needed, speech therapy.