My dad is more bothered than my stutter than I am

My dad is more bothered than my stutter than I am I'm trying to become a flight attendant at a major airline. I've been doing a lot of research into the interview process, and I'm pretty confident that I'll get the job. I also have a stutter. It's just enough to be noticeable, but it doesn't really bother me. I just talk anyway, even if it takes a little longer. My dad is very supportive, but he's worried that my stutter will hold me back. I don't think it's that big of an issue, but he's worried that the interviewer will interpret it as me being nervous, or that it would impact my ability to guide passengers out of the plane in an emergency. He wants me to go to speech therapy to deal with it, but I really don't want to. I went to speech therapy as a kid, and I didn't find it to be all that helpful. I'm aware that it's different when you're an adult, but at this point, I have my own strategies for dealing with it that I'm satisfied with. It's taken a long time for me to accept this part of myself, and as I've gotten more comfortable with having it, it's actually lessened in severity. It only becomes a problem when I start thinking of it as a problem, as it turns into a feedback loop of being nervous that I'll stutter and then stuttering because I'm nervous. so yeah. It's frustrating. It's like he doesn't trust me to understand myself and how my own mouth works.