Many people, probably most people, change quite a bit in terms of interets as they move from school age into adulthood. Even if your interests don't change, your profession might as you move through your working life. Change is inevitable and, often, beneficial. Looking at things this way, choosing what you want to be becomes a temporary concern, not a permanent one.
In the end, we are our history, not our profession. We're defined by thousands of days, not titles.
Hopefully, this perspective helps to see things in a light that removes some of the strain of the big decisions that face you as a student.