I've stuttered since I was 8, now I'm 25. I understand your fear because I had the same fear. I recently finished the maritime academy in my country and I am now currently a PhD student. It all seemed impossible to me, and I was afraid I wouldn't be taken seriously as an officer aboard, and as a girl. But I kept fighting and am still fighting today. I'm still not fluent, I sometimes get depressed, but when I remember how far I've come, I also feel proud of myself. So my advice is, just fight through. You are good enough and you have to believe it. And once you get there, you'll feel very empowered, trust me. Good luck!