It's kind of psychological.

It's kind of psychological. I feel I stutter psychologically, when I talk with my mom, I never stutter, but when I talk with my dad(whom I fear much) or teachers or strangers, I get blocked on some syllables, like "R", "S". For example, I can't say STATION, REMOTE, STEM, I hope u understand what I mean to say. I feel it comes from fear and also what would others feel if I don't say properly. But when a teacher asks me in school and I answer correctly (maybe by stuttering), I ask myself, " Was that so hard"?