Why can’t I use my techniques around my friends and family?

Why can’t I use my techniques around my friends and family? So, I obviously stutter; but lately it’s been getting worse and I don’t know why. Now, my parents, friends and girlfriend know I stutter and want to help me but they all noticed it’s getting worse lately and i know. But why can’t I use my techniques? I know what to do- stretch the vowel and forget the “ums and uh” as a filler and let the stutter happen. No one is going to make fun of me in my family or anything so why can’t I practice? When I talk with my speech therapist it’s so easy and I feel so fluent.