If you think how you're coming across in interviews isn't good because of your speech, you can try disclosing to your interviewer before you start ("hi, before we jump in I wanted to let you know I stutter so you'll hear me pause or repeat some sounds. Feel free to ask me to repeat anything if you need". something like that). Disclosing makes me feel a lot more comfortable. Makes them more comfortable too I think since you've addressed the elephant.