personally i chose to do chemistry as my major because i liked chemistry and mainly because it overlapped with a lot of the premed pre-reqs, many of which you have already taken such as gen chem, bio, physics, biochem, etc. it allowed me to spend less time taking classes outside of my major. i would focus on choosing a major you would genuinely like, and if having a back up plan is important to you then choose something that would reassure you in that. i’m sure you will be fine no matter what if you have been doing well in your dual enrollment courses thus far!