I only stutter when I think I'm going to stutter.

I only stutter when I think I'm going to stutter. If I'm not thinking about stuttering at all, I don't stutter, but the moment I start thinking that I'll stutter, that's when I stutter. Its so frustrating. I'll be talking perfectly fine, but then I'll start worrying that I'm going to stutter, and that makes me stutter. Does anyone else's stutter work the same way as mine? I know my stutter is 100% psychological, and its thankfully a lot better than it used to be, but I still feel so ashamed everytime I stutter. I was in speech therapy when I was a kid, but it wasn't helpful at all. The main advice which I got was to focus on how I was saying words, but since focusing on my stutter is what causes me to stutter, that advice is only made it worse. I also heard a bunch of other unhelpful advice, like to say words slowly or to say it while exhaling. That advice might work for some people, but it annoyed me so much that they actually thought it would work. I want to emphasize that the advice from speech therapists made my stutter worse since it caused me to focus on my stutter more. I remember when I was in middle school I saw a terrible speech therapist who didn't even give me any advice. It was me and a few other students, since this therapist worked for the school. She would ask us random question like "what do you want to be when you grow up?" which had nothing to do with stuttering at all. When I asked her why she was asking us these random questions, she said that it was to help us practice talking. I told her that I talk all the time, and it wasn't helping. Than she started imitating my stutter and said "d-do y-you r-really w-want t-to t-talk l-like t-this y-your w-whole l-life," and while she was saying that she was imitating my stutter. I should've reported her to the school, but I didn't. I've seen a few speech therapists, and they were all nice people except for her. I know this was a long post, but I just discovered this subreddit and wanted to share my story. Also, are most stutters psychological, or can there be a physical cause? I'm currently 25. I'm a man, and I was wondering if stuttering is more common in men than women.