Sister, we start fasting before the Fajr Adhaan, therefore we have to stop eating and drinking and rinse your mouth before the fajr adhaan.
For breaking your fast, you can do it as soon as it's time for Maghrib ie with the Maghrib Adhaan.
In non muslim countries, since we can't hear the adhaan from the mosques. You can use websites that calculate the adhaan times in your region. Some mosques also offer Adhaan schedules as printouts.
You can find your cities adhaan time on this link :-
http://www.islamicfinder.org/world.php
Enter your city name and note down the Fajr and Maghrib Adhaan times.
Remember us all in your dua, little sister. Take care
Wasalaamalaykum waa rahmatullahi