If you want to study chemistry and physics, then you will want go to graduate school. In that context, your undergraduate degree will be a check-box item. Go to a good college (and you’ll get into plenty of good colleges) that fits your financial situation and where you feel comfortable and can be happy. Harvard might very well not be that place, even if you get in. And while I’m giving gratuitous advice, I’ll say consider very carefully what you want to do eventually besides “study physics and chemistry.” You get to study (and enjoy) physics and chemistry while studying engineering, and an undergraduate engineering degree is a fine terminal degree–whereas a career in physics or chemistry is probably a good 7+ years down the road after you get your BS/BA (grad school + postdoc).