Actually, it's normal to drop out of college. To be honest, those seniors will understand. After all, everyone pursues different things, and forcing you to stay is embarrassing and unpleasant for both sides. Usually they don't do this. If you have a good relationship with people in your department, just say so. Although retired, I can still help when I have time when I am short of manpower. If the feelings are average, to be honest, everyone will not contact often after resigning. Maybe people won't remember you after the new trick, so don't think too much.

If you don't like it, leave it. Some departments in college are really chicken ribs.