There will always be this sense of unease when you are accosted by strangers.
In fact, in one of my English comprehension exercise to my students, I had one that dealt with dealing with strangers.
The most succinct points were those of escape.
When accosted, do not engage the strangers if possible. Try to get away from the situation. If there is harassment, shout for help.
And so it came to passed.
I was walking towards my car after class just last week.
While walking in the dark five-foot way, suddenly I heard a shout. A man on a motorbike harkened to me as if in need of help to get directions.
I smelled a rat. He could easily had stopped at the brighter coffee-shop areas to do that. Yet, he chose me walking solitarily in the dark shadows-an easy prey.
So, I pretended not to have heard him and quickly walked into the beckoning light of the coffee shop. Safety,at last.
I took my own advice,so it seems straight from the text of my own lesson!