Hello miss,I could not help reading your post without feeling empathy for your plight.Your only sin is being a decent person in a potentially threatening world,but at least you are aware of the threat, it is an unfortunate fact of life.
Now is the time for the next step..actually joining a street based self defence club,..in there (generally) you will meet like minded people with the same concerns,begin to learn how to THINK in a self preservation way and learn techniques that could literally save you.
I think Richie does a DVD on self defence for women,and joining a club accelerates the process which in turn will give you confidence.I won't lie it WILL take time and even doing classes can bring up self doubts in your own ability,put this down to the learning process-it is natural to doubt but not healthy to restrict your life because of 'what ifs'.
Search the web for classes local to you and if need be ask for advice on suitable ones on here ...you will recieve honest advice AND THEN JOIN ONE! You will have begun the important first step..taking back control of your life and starting the 'psycological' fight back.
Good luck,you are not alone.