I would definitely suggest giving therapy another shot. I think the people on here saying "don't worry about it" are unknowingly being dismissive towards your problem. The goal for most adult therapeutic interventions is not normal fluency, but rather a state in which stuttering occurs with less tension (stuttering modification) or a speech pattern that is volitional and consciously controlled due to relearning the components of fluent speech, including respiration, phonation, and articulation (fluency shaping).