I want some advices regarding my stuttering

I want some advices regarding my stuttering The thing is. I found out about myself that my stutter got worse over time because my dad used to highlight the moments when I stuttered. Then as time passed by, I started to be terrified by it to the point where I wouldn’t prefer to talk out loud because there was always this voice inside my head that told me “you are not able to get that word out”. Whenever I need to speak out loud I feel that my entire body gets tensed, I feel like I don’t have enough air to get out the words anymore. That only happens when I know that people are listening to me. I enter in this panic state that I hardly am able to get out to sometimes. Like for example the word “Apple”. When I know that Im in class and people are listening to me. The word “Apple” wont come out. Only “A”. Then I would try it again and again and in the end I manage to say it. I always feel embarrassed about it afterwards. I take these long pauses between words because my own mind gives me the impression that I don’t have enough air to say it and that I will stutter. It feels like a guy is watching me intensely and doubts me at the same time. But when Im alone in the room and I know that no one is listening or watching, the stutter dissapears. So I know that the main source is social anxiety and the fact that fearing that I will stutter will ultimately make me stutter. I just don’t know what must I do to stop my brain being such a drama queen in this situation. And all the advices regarding elongating vowels don’t seem to work. Because in that moment I panic so hard unconsciously that I just forget about all these methods that prevents the actual stutter. I want to find a way to be as relaxed as when Im in my own room alone knowing that Im not heared or watched. Im so sick of it