IB subjects vs. what you studied / study in uni

Hi, this fall I will begin the IBDP and since I still don’t know what I want to study, I wondered if someone else has been / are in the same position and which subjects you took.
And for other students, when did your know what you wanted to study, and why did you want to pursue that career?
Appreciate if you include your subjects in the IB here as well :)

I only know that i want to work within the STEM field, hence my chosen subjects.
HL: Math AA, Chem, Physics, Norwegian literature
SL: English lang&lit, Psychology