Hi... The phobia you are experiencing is not very uncommon and at least 3-5%of population experience it.
The cause of phobia is usually unwanted or painful experiences in childhood which are deep in our memory and do not come on surface in state of full consciousness.
Next Steps
You should meet a psychologist who can help you figure out reason of developing the problem and how to come out of it.
Health Tips
More you avoid such places more strong phobia you will develop. So rather escaping you need to develop the habit of facing it.