Anxiety/Stress physiological stutter?

Anxiety/Stress physiological stutter? I often times stutter on certain words specifically on A and E words. In certain situations I physically can’t say the words starting with those specific word. I feel like it’s situational because when I say those words alone I don’t stutter at all. I feel like I just stop breathing and I have also tried talking with exhale but still no good. Also, I stutter/stop on other words as well occasionally. I feel like it’s 100% physiological. I just don’t know how to fix it. I am currently 17. Help please.