Are teens who think they have their life figured out naive?

I do honestly believe that I know exactly what I want to do with my life when I'm older. I'm 15, I've already started looking at colleges, my boyfriend's mom who is a manager at Kroger is getting me a job as soon as I turn 16, and I also believe that the boy I am with is who I will marry and spend the rest of my life with (we have been dating for 14 months, and we've never even came close to breaking up, dispite our fights we have.). Him and I also know exactly what we want to do as our professions, where we want to live after hs, and even how many animals/ kids we want, lol! Does me feeling like I know exactly what I want in life at such a young age make me seem naive?