I do this, sometimes I say tha-tha-th-tha-thats all folks right after I stutter, cant fight it, cant cure it but I sure as heck can change how I respond to it and humors my go to. I never really feel embarrassed for stuttering though, we all have things that were insecure about for some its stuttering for others its weight etc. I'm not the only person in the world to be insecure about something and neither are you. Once you get in your head that we're all human and we all have our own issues it becomes easier. Dont be hard on yourself just cause stuttering is your issue, theres other people out there with way worse disabilities then us imagine how they feel. Only thing you can do is love yourself and treat other people the way they'd like. Any decent person will do the same and if they dont then why do you care about their opinion anyways? At the end of our lives I'm sure as hell not gonna he thinking about what trinity from Walmart said when I was 23 so why would i now?