I completely understand how you are feeling, I stuttered in interviews before. What I found is that generally people are very supportive and understanding, some do know that we don't have much control over how we speak. Stuttering can hold you back but it is just one obstacle which we have to overcome, and the big difference is how we overcome it. You mentioned that you would speak more and say more important stuff, but you can do that. If you talk people will listen and if they don't then that's someone not worth talking to.