How far have you gotten with you math?
The reason why I asking is because I have bachelor in physics and I ve spent about 16-18 hours A day on studying multivariable calculus, differential equations, applied physics , thermodynamics, and quantum physics theory, both level 1 and 2 for little over 2 years. Masters degree will require even more and unless you re a dedicated physicist - don't even think about studying physics on master level. M.S. requires 120% of your dedication. ph.d in physics means you re a full on SCIENTIST who works on new discoveries. It's not just "I'll sit in class go 2 years and wil get ph.d". ph.d means you have to study and run physics experiments I whatever field you want to go to (theoretical or lab) which typically takes years to achieve, unless you re extremely lucky and have a ground breaking thesis paper.
In short, You won't have any time for any filmmaking if you want to have bachelor degree in physics and also "study" film at the same time.
Both filmmaking and science require your entire dedication.
The good news is that you re very young and can experiment with both fields. Try filmmaking and study science, sure. But going for PhD with physics/chemistry AND trying to establish a career in filmmaking - italy goof to work out. Gotta choose