Don’t show fear. Show courage. The courage to confront the stalker and let him know in no uncertain terms that the price of attacking you is his life. If he wants to put his ego up against your Glock, you can see who wins.
It’s too common for a woman to be alone with strangers for her to make a confrontation each time. Think about a shopping trip from a woman’s point of view. Getting to the car, carrying things, being smaller than half the population, children, etc.
Plus, a man will leave you alone until you look nervous - then he gets interested. His interest is always innocent, even helpful, until it’s not.