any tips to leave thoughts?

any tips to leave thoughts? I’m 17, and struggles with a stutter since I was 17. Around my family, I don’t stutter much, occasionally. But every time I’m in school or somewhere I always think if I will stutter or not, and it ALWAYS makes me stutter. The word “can I ….” Is hell, I always switch it “is it fine if I can”, I tried to test it out on workers, teachers alone, etc and never works for me, but if I’m not thinking about it I never do, any tips ? Also going to uni next year and I really wanna do finance, since my dad and brother are deeply into it, but my stutter is a big issue since talking is the most important part