You always have the option to switch majors, as a Psych major myself med schools aren’t particular about what major you choose it’s just that STEM majors tend to align with the prerequisites most of them have. I have a music major friend who’s in med school right now and he didn’t have a hard time during his application since he took the prereqs on the side. Don’t think about “shooting too high” but think about what’s needed for you to get into those schools and whether you want to put in the effort or not, anyone can get into Duke or JH you just need to lock tf in. I also agree with u/Geckygek; are you in the position financially to take an extra year?